Merge branch 'main' of https://github.com/StroepWafel/BetterSEQTA-Plus

.gitignore

@@ -23,4 +23,4 @@ betterseqtaplus-safari/
 .env
 .env.submit
 dependency-graph.svg
-/src/resources/themes
+

docs/CLOUD_SETTINGS_SYNC_SERVER.md

@@ -35,13 +35,16 @@ Upserts the caller’s settings backup.
 ```json
 {
   "schemaVersion": 1,
+  "themeId": "uuid-string-or-empty",
   "data": {
-    "...": "flat key-value map mirroring extension storage (see Payload shape)"
+    "...": "flat key-value map mirroring extension storage (see Payload shape)",
+    "selectedTheme": "uuid-or-empty-string"
   }
 }
 ```
 
 - **`schemaVersion`**: integer. The extension currently sends `1`. The server may reject unknown major versions or store it for future migrations.
+- **`themeId`**: optional but recommended duplicate of **`data.selectedTheme`**. Should be the UUID of the **installed** BetterSEQTA store theme (`selectedTheme`). This may be a normal theme id **or** a **flavour (slave) variant** id from themes with **`flavours[]`** — the extension uses it after restore to prefetch `theme.json` when missing locally (same **`GET …/themes/{id}/download`** as the store UI). Persist and return **`themeId`** in sync with **`data.selectedTheme`**.
 - **`data`**: object whose keys are storage keys (strings) and values are JSON-serializable values (same types as stored in `chrome.storage.local`).
 
 **Success response:** HTTP `200` (or `201` if you prefer create semantics). Example:
@@ -67,15 +70,19 @@ Returns the caller’s latest settings backup.
 ```json
 {
   "schemaVersion": 1,
+  "themeId": "uuid-string-or-empty",
   "data": { },
   "updated_at": "2026-04-07T12:00:00.000Z"
 }
 ```
 
 - **`data`**: required for restore; must be the same shape as accepted in `PUT` (flat map of storage keys).
+- **`themeId`**: optional; if present must match **`data.selectedTheme`** (see `PUT`).
 - **`schemaVersion`**: optional but recommended; should match what was stored.
 - **`updated_at`**: optional; included for UX if the client shows “last backup” time.
 
+The extension resolves **`themeId`** (if non-empty), else **`data.selectedTheme`,** to [`resolveThemeIdForPostSyncDownload`](../src/seqta/utils/cloudSettingsSync.ts) after downloading the envelope — used only to reinstall theme assets from **`betterseqta.org`** when IndexedDB lacks that id (see **BetterSEQTA Cloud** flavour note in **[THEME_STORE_FLAVOURS_API](./THEME_STORE_FLAVOURS_API.md)** section “Cloud settings sync compatibility”).
+
 **No backup yet:** HTTP **`404`**. The extension treats this as “nothing in the cloud” and shows an error to the user.
 
 **Error responses:** `401` if the token is invalid, etc.
@@ -128,6 +135,6 @@ This uses standard **WebExtension** APIs (`browser.alarms`, `runtime` messages,
 
 ## Client reference (extension)
 
-- Upload / dev export: `buildUploadPayload` / `getSnapshotForUpload` in `src/seqta/utils/cloudSettingsSync.ts` (strips OAuth-related keys, sensitive device keys, and **`bsplus_cloud_settings_known_remote_updated_at`**).
+- Upload / dev export: `buildUploadPayload` / `getSnapshotForUpload` in `src/seqta/utils/cloudSettingsSync.ts` (strips OAuth-related keys, sensitive device keys, **`bsplus_pending_theme_ensure_after_cloud`**, and **`bsplus_cloud_settings_known_remote_updated_at`** — includes **`themeId`** aligned with **`selectedTheme`**).
-- Download: `applyDownloadedEnvelope` after `GET`; local auth keys, sensitive device keys, and the client-only watermark key are merged back after `chrome.storage.local.clear()`.
+- Download: resolve id via **`resolveThemeIdForPostSyncDownload`** → **`applyDownloadedEnvelope`** after `GET` → prefetch theme blobs in page context if needed (**`prepareThemeAfterCloudSync`** in **`ThemeManager`**) → reload SEQTA tabs; local auth keys, sensitive device keys, client-only watermark, and **`bsplus_pending_theme_ensure_after_cloud`** semantics preserved as documented above.
 - Auto sync (summary, debounced upload, alarms): `src/background/cloudSettingsAutoSync.ts`; content script triggers a poll on each verified SEQTA Learn/Engage page load (top frame) via `cloudSettingsPoll`.

src/background.ts

@@ -5,6 +5,7 @@ import {
   initCloudSettingsAutoSync,
   performCloudSettingsDownloadWithRetry,
   performCloudSettingsUploadWithRetry,
+  requestCloudSettingsDebouncedUpload,
   runCloudSettingsPoll,
 } from "./background/cloudSettingsAutoSync";
 
@@ -346,6 +347,10 @@ const MESSAGE_HANDLERS: Record<string, MessageHandler> = {
     void runCloudSettingsPoll();
     return false;
   },
+  cloudSettingsRequestDebouncedUpload: () => {
+    requestCloudSettingsDebouncedUpload();
+    return false;
+  },
   getSeqtaSession: (req: { baseUrl?: string }, sendResponse: MessageSender, sender?: browser.Runtime.MessageSender) => {
     (async () => {
       try {

src/background/cloudSettingsAutoSync.ts

@@ -3,8 +3,10 @@ import {
   applyDownloadedEnvelope,
   buildUploadPayload,
   BSPLUS_CLOUD_KNOWN_REMOTE_UPDATED_AT_KEY,
+  BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY,
   CLOUD_SETTINGS_SYNC_SCHEMA_VERSION,
   isKeyIncludedInCloudUploadPayload,
+  resolveThemeIdForPostSyncDownload,
   setKnownRemoteUpdatedAt,
 } from "@/seqta/utils/cloudSettingsSync";
 
@@ -220,7 +222,15 @@ async function getSettingsAndApplyOnce(token: string): Promise<GetResult> {
         error: data?.error ?? `Download failed (${r.status})`,
       };
     }
+    const themeIdToEnsure = resolveThemeIdForPostSyncDownload(data);
     await applyDownloadedEnvelope(data);
+    if (themeIdToEnsure) {
+      await browser.storage.local.set({
+        [BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY]: themeIdToEnsure,
+      });
+    } else {
+      await browser.storage.local.remove(BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY);
+    }
     reloadSeqtaPagesFn?.();
     const updated_at = data?.updated_at as string | undefined;
     await setKnownRemoteUpdatedAt(updated_at);
@@ -352,6 +362,17 @@ function scheduleDebouncedUpload(): void {
   }, UPLOAD_DEBOUNCE_MS);
 }
 
+/** Call after store theme install (and similar) so cloud upload runs even if storage events are flaky. */
+export function requestCloudSettingsDebouncedUpload(): void {
+  void (async () => {
+    const all = (await browser.storage.local.get()) as Record<string, unknown>;
+    if (!isAutoCloudSyncEnabled(all)) return;
+    if (suppressAutoUploadDuringRestore) return;
+    if (!(await getAccessToken())) return;
+    scheduleDebouncedUpload();
+  })();
+}
+
 async function runDebouncedUploadJob(): Promise<void> {
   const all = (await browser.storage.local.get()) as Record<string, unknown>;
   if (!isAutoCloudSyncEnabled(all)) return;

src/interface/components/store/CoverSwiper.svelte

@@ -1,10 +1,13 @@
 <script lang="ts">
   import { fade } from 'svelte/transition';
-  import type { Theme } from '@/interface/types/Theme';
+  import type { ThemeCoverSlide } from '@/interface/types/Theme';
   import emblaCarouselSvelte from 'embla-carousel-svelte';
   import Autoplay from 'embla-carousel-autoplay';
 
-  let { coverThemes, setDisplayTheme } = $props<{ coverThemes: Theme[], setDisplayTheme: (theme: Theme) => void }>();
+  let { slides, setDisplayTheme } = $props<{
+    slides: ThemeCoverSlide[];
+    setDisplayTheme: (theme: import('@/interface/types/Theme').Theme) => void;
+  }>();
   let emblaApi = $state();
 
   const options = { loop: true };
@@ -12,8 +15,8 @@
     Autoplay({
       delay: 5000,
       stopOnInteraction: false,
-      stopOnMouseEnter: true
+      stopOnMouseEnter: true,
-    })
+    }),
   ];
 
   function onInit(event: CustomEvent) {
@@ -26,7 +29,7 @@
   const slideNext = () => emblaApi?.scrollNext();
 </script>
 
-{#if coverThemes.length > 0}
+{#if slides.length > 0}
   <div class="relative w-full overflow-clip rounded-xl transition-opacity" transition:fade>
     <div
       class="w-full aspect-[5/1] max-h-[500px]"
@@ -34,49 +37,69 @@
       onemblaInit={onInit}
     >
       <div class="flex">
-        {#each coverThemes as theme}
+        {#each slides as slide (slide.imageUrl + slide.title + (slide.subtitle ?? ''))}
           <div
             class="relative flex-[0_0_100%] cursor-pointer rounded-xl overflow-clip"
             role="button"
             tabindex="0"
-            onkeydown={(e) => { if (e.key === 'Enter') setDisplayTheme(theme) }}
+            onkeydown={(e) => {
-            onclick={() => setDisplayTheme(theme)}
+              if (e.key === 'Enter') setDisplayTheme(slide.openTheme);
+            }}
+            onclick={() => setDisplayTheme(slide.openTheme)}
           >
-            <img src={theme.marqueeImage || theme.coverImage} alt="Theme Preview" class="object-cover w-full h-full" />
+            <img src={slide.imageUrl} alt="" class="object-cover w-full h-full" />
-            {#if theme.featured === true}
+            {#if slide.badgeFeatured === true}
               <div class="absolute top-4 left-4 z-[2] pointer-events-none">
                 <span
                   class="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-semibold bg-amber-100 text-amber-900 dark:bg-amber-950 dark:text-amber-100 shadow-sm"
                   aria-label="Featured theme"
                 >
                   <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="w-3.5 h-3.5">
-                    <path fill-rule="evenodd" d="M10.788 3.21c.448-1.077 1.976-1.077 2.424 0l2.082 5.006 5.404.434c1.164.093 1.636 1.545.749 2.305l-4.117 3.527 1.257 5.273c.271 1.136-.964 2.033-1.96 1.425L12 18.354 7.373 21.18c-.996.608-2.231-.29-1.96-1.425l1.257-5.273-4.117-3.527c-.887-.76-.415-2.212.749-2.305l5.404-.434 2.082-5.005Z" clip-rule="evenodd" />
+                    <path
+                      fill-rule="evenodd"
+                      d="M10.788 3.21c.448-1.077 1.976-1.077 2.424 0l2.082 5.006 5.404.434c1.164.093 1.636 1.545.749 2.305l-4.117 3.527 1.257 5.273c.271 1.136-.964 2.033-1.96 1.425L12 18.354 7.373 21.18c-.996.608-2.231-.29-1.96-1.425l1.257-5.273-4.117-3.527c-.887-.76-.415-2.212.749-2.305l5.404-.434 2.082-5.005Z"
+                      clip-rule="evenodd"
+                    />
                   </svg>
                   Featured
                 </span>
               </div>
             {/if}
-            <div class='absolute bottom-0 left-0 p-8 z-[1]'>
+            <div class="absolute bottom-0 left-0 p-8 z-[1]">
-              <h2 class='text-4xl font-bold text-white'>{theme.name}</h2>
+              <h2 class="text-4xl font-bold text-white">{slide.title}</h2>
-              {#if theme.author}
+              {#if slide.subtitle}
-                <p class="text-sm text-white/90 mt-1 mb-1 line-clamp-1">By {theme.author}</p>
+                <p class="text-lg font-medium text-white/95 mt-1 line-clamp-2">{slide.subtitle}</p>
+              {/if}
+              {#if slide.openTheme.author && !slide.subtitle}
+                <p class="text-sm text-white/90 mt-1 mb-1 line-clamp-1">By {slide.openTheme.author}</p>
+              {/if}
+              {#if slide.openTheme.description && !slide.subtitle}
+                <p class="text-lg text-white line-clamp-3">{slide.openTheme.description}</p>
               {/if}
-              <p class='text-lg text-white'>{theme.description}</p>
             </div>
-            <div class='absolute bottom-0 left-0 w-full h-1/2 to-transparent bg-linear-to-t from-black/80'></div>
+            <div class="absolute bottom-0 left-0 w-full h-1/2 to-transparent bg-linear-to-t from-black/80"></div>
           </div>
         {/each}
       </div>
     </div>
 
-    <!-- Navigation buttons -->
+    <div class="flex absolute right-2 bottom-2 z-10 gap-2">
-    <div class='flex absolute right-2 bottom-2 z-10 gap-2'>
+      <button
-      <button aria-label="Previous" onclick={slidePrev} class='flex justify-center items-center w-8 h-8 text-white rounded-full bg-black/50 dark:bg-zinc-800'>
+        aria-label="Previous"
+        onclick={slidePrev}
+        type="button"
+        class="flex justify-center items-center w-8 h-8 text-white rounded-full bg-black/50 dark:bg-zinc-800 transition-all duration-200"
+      >
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width={1.5} stroke="currentColor" class="w-6 h-6">
           <path stroke-linecap="round" stroke-linejoin="round" d="m15.75 19.5-7.5-7.5 7.5-7.5" />
         </svg>
       </button>
-      <button aria-label="Next" onclick={slideNext} class='flex justify-center items-center w-8 h-8 text-white rounded-full bg-black/50 dark:bg-zinc-800'>
+      <button
+        aria-label="Next"
+        onclick={slideNext}
+        type="button"
+        class="flex justify-center items-center w-8 h-8 text-white rounded-full bg-black/50 dark:bg-zinc-800 transition-all duration-200"
+      >
         <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width={1.5} stroke="currentColor" class="w-6 h-6">
           <path stroke-linecap="round" stroke-linejoin="round" d="m8.25 4.5 7.5 7.5-7.5 7.5" />
         </svg>

src/interface/components/store/ThemeCard.svelte

@@ -1,14 +1,54 @@
 <script lang="ts">
   import type { Theme } from '@/interface/types/Theme'
+  import {
+    masterGridDisplayDownloadCount,
+    gridCardPreviewImageUrls,
+  } from '@/interface/utils/themeStoreFlavours'
   import { fade } from 'svelte/transition';
   import { onMount } from 'svelte';
-  let { theme, onClick, toggleFavorite, isLoggedIn, onRequestSignIn } = $props<{
+  import emblaCarouselSvelte from 'embla-carousel-svelte';
+  import Autoplay from 'embla-carousel-autoplay';
+  let { theme, onClick, toggleFavorite, isLoggedIn, onRequestSignIn, allStoreThemeRows } = $props<{
     theme: Theme;
     onClick: () => void;
     toggleFavorite: (theme: Theme) => void;
     isLoggedIn: boolean;
     onRequestSignIn?: () => void;
+    /** Raw API themes (includes hidden slaves) for aggregated master download totals */
+    allStoreThemeRows?: Theme[];
   }>();
+
+  const displayDownloadCount = $derived(
+    allStoreThemeRows != null
+      ? masterGridDisplayDownloadCount(theme, allStoreThemeRows)
+      : (theme.download_count ?? 0),
+  );
+
+  const gridRotatorUrls = $derived(gridCardPreviewImageUrls(theme, allStoreThemeRows));
+
+  /** Mirrors CoverSwiper (featured bar): horizontal slides + autoplay */
+  function prefersReducedMotion(): boolean {
+    return typeof window !== 'undefined' && window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+  }
+
+  /** Read once synchronously where `window` exists so reduced-motion doesn’t briefly mount carousel */
+  let allowSlideAutoplay = $state(!prefersReducedMotion());
+
+  const gridEmblaKey = $derived(gridRotatorUrls.join('|'));
+
+  const gridEmblaOptions = $derived({ loop: gridRotatorUrls.length > 1 });
+
+  const gridEmblaPlugins = $derived.by(() => {
+    if (!allowSlideAutoplay || gridRotatorUrls.length <= 1) return [];
+    return [
+      Autoplay({
+        delay: 2000,
+        stopOnInteraction: false,
+        stopOnMouseEnter: true,
+      }),
+    ];
+  });
+
   let menuOpen = $state(false);
   let menuRef: HTMLDivElement;
 
@@ -111,7 +151,7 @@
           <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-3.5 h-3.5">
             <path stroke-linecap="round" stroke-linejoin="round" d="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5M16.5 12L12 16.5m0 0L7.5 12m4.5 4.5V3" />
           </svg>
-          {(theme.download_count ?? 0).toLocaleString()}
+          {displayDownloadCount.toLocaleString()}
         </span>
         <span class="flex items-center gap-1">
           <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill={theme.is_favorited ? 'currentColor' : 'none'} stroke="currentColor" stroke-width="1.5" class="w-3.5 h-3.5">
@@ -122,8 +162,40 @@
       </div>
     </div>
     <div class='absolute bottom-0 z-0 w-full h-3/4 bg-linear-to-t to-transparent from-black/80'></div>
-    <div class='w-full'>
+    {#if gridRotatorUrls.length === 0}
-      <img src={theme.marqueeImage || theme.coverImage} alt="Theme Preview" class="object-cover w-full h-48 rounded-md" />
+      <div class="relative w-full h-48 overflow-hidden rounded-md bg-zinc-200 dark:bg-zinc-700" aria-hidden="true"></div>
+    {:else if !allowSlideAutoplay || gridRotatorUrls.length === 1}
+      <div class="relative w-full h-48 overflow-hidden rounded-md">
+        <img
+          src={gridRotatorUrls[0] ?? theme.marqueeImage ?? theme.coverImage}
+          alt=""
+          class="object-cover w-full h-full"
+          draggable="false"
+        />
       </div>
+    {:else}
+      {#key gridEmblaKey}
+        <div
+          class="relative w-full h-48 overflow-hidden rounded-md"
+          use:emblaCarouselSvelte={{
+            options: gridEmblaOptions,
+            plugins: gridEmblaPlugins,
+          }}
+        >
+          <div class="flex h-full">
+            {#each gridRotatorUrls as url (url)}
+              <div class="relative flex-[0_0_100%] min-w-0 h-full shrink-0">
+                <img
+                  src={url}
+                  alt=""
+                  class="object-cover w-full h-full select-none"
+                  draggable="false"
+                />
+              </div>
+            {/each}
+          </div>
+        </div>
+      {/key}
+    {/if}
   </div>
 </div>

src/interface/components/store/ThemeGrid.svelte

@@ -2,13 +2,23 @@
   import type { Theme } from '@/interface/types/Theme'
   import ThemeCard from './ThemeCard.svelte';
 
-  let { themes, searchTerm, setDisplayTheme, toggleFavorite, isLoggedIn, onRequestSignIn } = $props<{
+  let {
+    themes,
+    searchTerm,
+    setDisplayTheme,
+    toggleFavorite,
+    isLoggedIn,
+    onRequestSignIn,
+    allStoreThemeRows,
+  } = $props<{
     themes: Theme[];
     searchTerm: string;
     setDisplayTheme: (theme: Theme) => void;
     toggleFavorite: (theme: Theme) => void;
     isLoggedIn: boolean;
     onRequestSignIn?: () => void;
+    /** Raw API list (includes `slave` rows) for master download aggregation */
+    allStoreThemeRows?: Theme[];
   }>();
   
   let filteredThemes = $derived(themes.filter((theme: Theme) =>
@@ -25,6 +35,7 @@
         {toggleFavorite}
         {isLoggedIn}
         {onRequestSignIn}
+        {allStoreThemeRows}
       />
     {/each}
   

src/interface/pages/store.svelte

@@ -7,6 +7,7 @@
   import SkeletonLoader from '../components/SkeletonLoader.svelte';
   import { settingsState } from '@/seqta/utils/listeners/SettingsState'
   import type { Theme } from '../types/Theme'
+  import { visibleStoreThemes, buildCoverSlidesForThemes } from '@/interface/utils/themeStoreFlavours'
   import browser from 'webextension-polyfill'
   import ThemeModal from '../components/store/ThemeModal.svelte'
   import Header from '../components/store/Header.svelte'
@@ -26,7 +27,12 @@
   // State variables
   let searchTerm = $state('');
   let themes = $state<Theme[]>([]);
-  let coverThemes = $state<Theme[]>([]);
+
+  /** Grid/search/cover: hides flat-listed slaves when API sends them */
+  let listThemes = $derived(visibleStoreThemes(themes));
+
+  /** Cover marquee slides (master + flavour imagery for top masters) */
+  let coverSlides = $derived(buildCoverSlidesForThemes(listThemes.slice(0, 3)));
   let loading = $state(true);
   let darkMode = $state(false);
   let displayTheme = $state<Theme | null>(null);
@@ -108,7 +114,6 @@
         throw new Error(data?.error || 'Failed to fetch themes');
       }
       themes = [...data.data.themes].sort(compareStoreThemes);
-      coverThemes = themes.slice(0, 3);
 
       loading = false;
     } catch (err) {
@@ -128,13 +133,36 @@
 
   // Filter themes (list is already featured-first, then newest; filter preserves order)
   let filteredThemes = $derived(
-    themes.filter(
+    listThemes.filter(
       (theme) =>
         theme.name.toLowerCase().includes(searchTerm.toLowerCase()) ||
         theme.description.toLowerCase().includes(searchTerm.toLowerCase()),
     ),
   );
 
+  async function installThemeFromStore(themeId: string, meta: Theme) {
+    const fullRow = themes.find((x) => x.id === themeId);
+    if (fullRow) {
+      await themeManager.downloadTheme(fullRow);
+    } else {
+      const flavour = meta.flavours?.find((f) => f.id === themeId);
+      await themeManager.downloadTheme({
+        id: themeId,
+        name: flavour?.name ?? meta.name,
+      } as Theme);
+    }
+    await themeManager.setTheme(themeId);
+    themeUpdates.triggerUpdate();
+    await fetchCurrentThemes();
+    void browser.runtime.sendMessage({ type: 'cloudSettingsRequestDebouncedUpload' }).catch(() => {});
+  }
+
+  async function removeThemeFromStore(themeId: string) {
+    await themeManager.deleteTheme(themeId);
+    themeUpdates.triggerUpdate();
+    await fetchCurrentThemes();
+  }
+
   $effect(() => {
     loadBackground();
     selectedBackground
@@ -172,12 +200,13 @@
         <!-- Themes Tab Content -->
         {#if activeTab === 'themes'}
           {#if searchTerm === ''}
-            <CoverSwiper {coverThemes} {setDisplayTheme} />
+            <CoverSwiper slides={coverSlides} {setDisplayTheme} />
           {/if}
     
           <!-- ThemeGrid to display filtered themes -->
           <ThemeGrid
             themes={filteredThemes}
+            allStoreThemeRows={themes}
             {searchTerm}
             {setDisplayTheme}
             {toggleFavorite}
@@ -188,28 +217,20 @@
           {#if displayTheme}
             <ThemeModal
               currentThemes={currentThemes}
-              allThemes={themes}
+              allThemes={listThemes}
+              allStoreThemeRows={themes}
               theme={displayTheme}
               {displayTheme}
               {setDisplayTheme}
               {toggleFavorite}
               isLoggedIn={cloudLoggedIn}
               onRequestSignIn={() => (showSignInOverlay = true)}
-              onInstall={async () => {
+              onInstall={async (themeId: string) => {
-                if (displayTheme) {
+                if (displayTheme) await installThemeFromStore(themeId, displayTheme);
-                  await themeManager.downloadTheme(displayTheme);
-                  await themeManager.setTheme(displayTheme.id);
-                  themeUpdates.triggerUpdate();
-                  await fetchCurrentThemes();
-                }
               }}
-              onRemove={async () => {
+              onRemove={async (themeId: string) => {
-                if (displayTheme?.id) {
+                console.debug('deleting theme', themeId);
-                  console.debug('deleting theme', displayTheme.id);
+                await removeThemeFromStore(themeId);
-                  await themeManager.deleteTheme(displayTheme.id);
-                  themeUpdates.triggerUpdate();
-                  await fetchCurrentThemes();
-                }
               }}
             />
           {/if}

src/interface/types/Theme.ts

@@ -1,3 +1,17 @@
+export type ThemeRole = "standard" | "master" | "slave";
+
+/** List/detail metadata for variants of a master theme (full theme.json fetched at install by id). */
+export type ThemeFlavour = {
+  id: string;
+  name: string;
+  /** Mirrors theme.json accent (e.g. defaultColour); used for install picker buttons */
+  accent_color: string;
+  cover_image: string;
+  marquee_image?: string;
+  /** Per-variant installs when slaves are not returned as flat `theme_role` rows */
+  download_count?: number;
+};
+
 export type Theme = {
   id: string;
   name: string;
@@ -15,4 +29,22 @@ export type Theme = {
   created_at?: number;
   /** Unix seconds — last server update (GET /api/themes). */
   updated_at?: number;
+  /** Omitted / `standard` — show in grid. `slave` hides from grid. `master` can list `flavours`. */
+  theme_role?: ThemeRole;
+  /** Present when `theme_role === "slave"` and API returns a flat list during migration */
+  master_id?: string;
+  /** Variants nested on master rows; installs use flavour `id` */
+  flavours?: ThemeFlavour[];
+};
+
+/** One marquee slide (cover hero or modal carousel). */
+export type ThemeCoverSlide = {
+  imageUrl: string;
+  /** Main line — usually master name */
+  title: string;
+  /** Subline — flavour name when applicable */
+  subtitle?: string;
+  /** Opening the modal uses this theme (always the grid row / master object) */
+  openTheme: Theme;
+  badgeFeatured?: boolean;
 };

src/interface/utils/themeStoreFlavours.ts

@@ -0,0 +1,165 @@
+import type { Theme, ThemeCoverSlide, ThemeFlavour } from "@/interface/types/Theme";
+
+export function isHiddenStoreTheme(theme: Theme): boolean {
+  return theme.theme_role === "slave";
+}
+
+/** Grid and search: omit slave rows (when API sends a flattened list). */
+export function visibleStoreThemes(themes: Theme[]): Theme[] {
+  return themes.filter((t) => !isHiddenStoreTheme(t));
+}
+
+function marqueeOrCoverUrl(t: { marqueeImage?: string; coverImage: string }): string {
+  return t.marqueeImage || t.coverImage;
+}
+
+/**
+ * Builds slides for CoverSwiper: for each top-N master, first master image then each flavour image.
+ */
+export function buildCoverSlidesForThemes(topThemes: Theme[]): ThemeCoverSlide[] {
+  const slides: ThemeCoverSlide[] = [];
+  for (const theme of topThemes) {
+    const flavours = theme.flavours ?? [];
+    if (flavours.length === 0) {
+      slides.push({
+        imageUrl: marqueeOrCoverUrl(theme),
+        title: theme.name,
+        subtitle: theme.author ? `By ${theme.author}` : undefined,
+        openTheme: theme,
+        badgeFeatured: theme.featured === true,
+      });
+      continue;
+    }
+    slides.push({
+      imageUrl: marqueeOrCoverUrl(theme),
+      title: theme.name,
+      subtitle: theme.author ? `By ${theme.author}` : undefined,
+      openTheme: theme,
+      badgeFeatured: theme.featured === true,
+    });
+    for (const f of flavours) {
+      slides.push({
+        imageUrl: f.marquee_image || f.cover_image,
+        title: theme.name,
+        subtitle: f.name,
+        openTheme: theme,
+        badgeFeatured: theme.featured === true,
+      });
+    }
+  }
+  return slides;
+}
+
+export type ModalHeroSlide = { imageUrl: string; caption: string };
+
+/** Preview image for carousel + flavour picker (matches hero slide order after master slide). */
+export function flavourCarouselImageUrl(f: ThemeFlavour): string {
+  const u = (f.marquee_image || f.cover_image || "").trim();
+  return u;
+}
+
+/** Preview image for master variant tile (modal hero slide 0). */
+export function masterCarouselImageUrl(t: Theme): string {
+  return (marqueeOrCoverUrl(t) || "").trim();
+}
+
+/**
+ * Ordered preview URLs for the store grid card rotator: master first, then each variant.
+ * Uses nested `flavours` when present; otherwise flat `slave` rows (same order as modal when possible).
+ */
+export function gridCardPreviewImageUrls(theme: Theme, allStoreRows?: Theme[]): string[] {
+  const urls: string[] = [];
+  const push = (raw: string) => {
+    const u = raw.trim();
+    if (u && !urls.includes(u)) urls.push(u);
+  };
+
+  push(marqueeOrCoverUrl(theme) || "");
+
+  const flavours = theme.flavours ?? [];
+  if (flavours.length > 0) {
+    for (const f of flavours) {
+      push(flavourCarouselImageUrl(f));
+    }
+    return urls.length > 0 ? urls : [(theme.coverImage || "").trim()].filter(Boolean);
+  }
+
+  if (allStoreRows) {
+    const slaves = allStoreRows
+      .filter((t) => t.theme_role === "slave" && t.master_id === theme.id)
+      .sort((a, b) => a.id.localeCompare(b.id));
+    for (const s of slaves) {
+      push((marqueeOrCoverUrl(s) || "").trim());
+    }
+  }
+
+  if (urls.length > 0) return urls;
+  const fallback = (theme.coverImage || "").trim();
+  return fallback ? [fallback] : [];
+}
+
+/**
+ * Downloads shown on the grid card for a master row: master's count plus each slave
+ * (flat `theme_role === "slave"` with `master_id`) and any flavour-only `download_count`
+ * when there is no matching flat slave id (nested-only API shape).
+ */
+export function masterGridDisplayDownloadCount(master: Theme, allStoreRows: Theme[]): number {
+  let total = master.download_count ?? 0;
+  const slaveRows = allStoreRows.filter(
+    (t) => t.theme_role === "slave" && t.master_id === master.id,
+  );
+  const countedIds = new Set(slaveRows.map((r) => r.id));
+  for (const r of slaveRows) {
+    total += r.download_count ?? 0;
+  }
+  for (const f of master.flavours ?? []) {
+    if (countedIds.has(f.id)) continue;
+    total += f.download_count ?? 0;
+  }
+  return total;
+}
+
+/** Modal hero: master first, then each flavour (plan order). */
+export function buildModalHeroSlides(theme: Theme): ModalHeroSlide[] {
+  const slides: ModalHeroSlide[] = [];
+  slides.push({
+    imageUrl: marqueeOrCoverUrl(theme),
+    caption: theme.name,
+  });
+  const flavours = theme.flavours ?? [];
+  for (const f of flavours) {
+    slides.push({
+      imageUrl: f.marquee_image || f.cover_image,
+      caption: `${theme.name} — ${f.name}`,
+    });
+  }
+  return slides;
+}
+
+/**
+ * Relative luminance 0–1 for rgba/rgb/hex-ish strings; fallback 0.5 → white text
+ */
+export function pickContrastingTextColor(backgroundCss: string): "#ffffff" | "#0a0a0a" {
+  const s = backgroundCss.trim();
+  const rgba = s.match(
+    /rgba?\(\s*([\d.]+)\s*,\s*([\d.]+)\s*,\s*([\d.]+)(?:\s*,\s*([\d.]+))?\s*\)/i,
+  );
+  if (rgba) {
+    const r = Number(rgba[1]) / 255;
+    const g = Number(rgba[2]) / 255;
+    const b = Number(rgba[3]) / 255;
+    const a = rgba[4] !== undefined ? Number(rgba[4]) : 1;
+    const lum = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+    const effective = lum * a + 0.05 * (1 - a);
+    return effective > 0.45 ? "#0a0a0a" : "#ffffff";
+  }
+  const hex = s.match(/^#?([\da-f]{2})([\da-f]{2})([\da-f]{2})$/i);
+  if (hex) {
+    const r = parseInt(hex[1], 16) / 255;
+    const g = parseInt(hex[2], 16) / 255;
+    const b = parseInt(hex[3], 16) / 255;
+    const lum = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+    return lum > 0.45 ? "#0a0a0a" : "#ffffff";
+  }
+  return "#ffffff";
+}

src/plugins/built-in/assessmentsOverview/api.ts

@@ -28,9 +28,17 @@ async function fetchJSON(url: string, body: any) {
 
 async function loadSubjects() {
   const res = await fetchJSON("/seqta/student/load/subjects?", {});
-  return res.payload
+  const activeGroup = res.payload.find((s: any) => s.active === 1);
-    .filter((s: any) => s.active === 1)
+  const activeYear = activeGroup?.year;
+  const allSubjects = res.payload
+    .filter((s: any) => s.year === activeYear)
     .flatMap((s: any) => s.subjects);
+  const seen = new Set<string>();
+  return allSubjects.filter((s: Subject) => {
+    if (seen.has(s.code)) return false;
+    seen.add(s.code);
+    return true;
+  });
 }
 
 async function loadPrefs(student: number) {

src/plugins/built-in/messageFolders/index.ts

@@ -0,0 +1,748 @@
+import type { Plugin } from "../../core/types";
+import { booleanSetting } from "@/plugins/core/settingsHelpers";
+import { waitForElm } from "@/seqta/utils/waitForElm";
+import styles from "./styles.css?inline";
+
+const messageFoldersSettings = {
+  showTagsInAllMessages: booleanSetting({
+    default: true,
+    title: "Show folder tags in All Messages",
+    description:
+      "When off, folder tags are not shown on the message list until you select a folder.",
+  }),
+  hideFolderedMessagesInAll: booleanSetting({
+    default: true,
+    title: "Hide foldered messages in All Messages",
+    description:
+      "When on, messages assigned to a custom folder are hidden from the inbox until you open that folder.",
+  }),
+} as const;
+
+interface Folder {
+  id: string;
+  name: string;
+  color: string;
+}
+
+interface MessageFoldersStorage {
+  folders: Folder[];
+  messageAssignments: Record<string, string[]>;
+}
+
+const FOLDER_COLORS = [
+  "#3b82f6", "#ef4444", "#22c55e", "#f59e0b",
+  "#8b5cf6", "#ec4899", "#14b8a6", "#f97316",
+];
+
+const FOLDER_ICON_SVG = `<svg style="width:24px;height:24px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#888" d="M10 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2h-8l-2-2z"/></svg>`;
+const PLUS_SVG = `<svg style="width:14px;height:14px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#888" d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>`;
+const CHECK_SVG_WHITE = `<svg style="width:14px;height:14px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#fff" d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z"/></svg>`;
+const CLOSE_SVG = `<svg style="width:14px;height:14px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#888" d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41z"/></svg>`;
+const EDIT_SVG = `<svg style="width:12px;height:12px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#888" d="M3 17.25V21h3.75L17.81 9.94l-3.75-3.75L3 17.25zM20.71 7.04a1 1 0 0 0 0-1.41l-2.34-2.34a1 1 0 0 0-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83z"/></svg>`;
+const TRASH_SVG = `<svg style="width:12px;height:12px;flex-shrink:0" viewBox="0 0 24 24"><path fill="#888" d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z"/></svg>`;
+
+function generateId(): string {
+  return Date.now().toString(36) + Math.random().toString(36).slice(2, 7);
+}
+
+const messageFoldersPlugin: Plugin<typeof messageFoldersSettings, MessageFoldersStorage> = {
+  id: "messageFolders",
+  name: "Message Folders",
+  description: "Organize direct messages into custom folders",
+  version: "1.0.0",
+  settings: messageFoldersSettings,
+  disableToggle: true,
+  defaultEnabled: true,
+
+  run: async (api) => {
+    const styleEl = document.createElement("style");
+    styleEl.textContent = styles;
+    document.head.appendChild(styleEl);
+
+    await api.storage.loaded;
+
+    if (!api.storage.folders) api.storage.folders = [];
+    if (!api.storage.messageAssignments) api.storage.messageAssignments = {};
+
+    let activeFolderId: string | null = null;
+    let messageListObserver: MutationObserver | null = null;
+    let sidebarObserver: MutationObserver | null = null;
+    let actionsObserver: MutationObserver | null = null;
+    let openDropdown: HTMLElement | null = null;
+    let dropdownCloseHandler: ((e: MouseEvent) => void) | null = null;
+    const unregisters: Array<{ unregister: () => void }> = [];
+
+    // ── Storage accessors ──
+
+    const getFolders = (): Folder[] => api.storage.folders ?? [];
+    const getAssignments = (): Record<string, string[]> => api.storage.messageAssignments ?? {};
+
+    const saveFolders = (folders: Folder[]) => {
+      api.storage.folders = [...folders];
+    };
+
+    const saveAssignments = (assignments: Record<string, string[]>) => {
+      api.storage.messageAssignments = { ...assignments };
+    };
+
+    const getMessageFolderIds = (messageId: string): string[] => {
+      const assignments = getAssignments();
+      const ids: string[] = [];
+      for (const [folderId, msgIds] of Object.entries(assignments)) {
+        if (msgIds.includes(messageId)) ids.push(folderId);
+      }
+      return ids;
+    };
+
+    const toggleMessageInFolder = (messageId: string, folderId: string) => {
+      const assignments = getAssignments();
+      if (!assignments[folderId]) assignments[folderId] = [];
+      const idx = assignments[folderId].indexOf(messageId);
+      if (idx >= 0) {
+        assignments[folderId].splice(idx, 1);
+      } else {
+        assignments[folderId].push(messageId);
+      }
+      saveAssignments(assignments);
+    };
+
+    const getFolderMessageCount = (folderId: string): number => {
+      return (getAssignments()[folderId] ?? []).length;
+    };
+
+    const restoreSubjectPlain = (subject: Element) => {
+      subject.querySelector(".bsplus-msg-badges")?.remove();
+      const textWrap = subject.querySelector(".bsplus-subject-text");
+      if (textWrap) {
+        subject.textContent = textWrap.textContent ?? "";
+      }
+    };
+
+    const isMessageInAnyCustomFolder = (messageId: string): boolean => {
+      for (const msgIds of Object.values(getAssignments())) {
+        if (msgIds.includes(messageId)) return true;
+      }
+      return false;
+    };
+
+    const shouldShowBadgesInList = (): boolean => {
+      return api.settings.showTagsInAllMessages || activeFolderId !== null;
+    };
+
+    // ── Confirm modal ──
+
+    const showConfirmModal = (
+      title: string,
+      message: string,
+      onConfirm: () => void,
+    ) => {
+      const overlay = document.createElement("div");
+      overlay.className = "bsplus-modal-overlay";
+
+      const modal = document.createElement("div");
+      modal.className = "bsplus-modal";
+      modal.innerHTML = `
+        <h3>${title}</h3>
+        <p>${message}</p>
+        <div class="bsplus-modal-actions">
+          <button class="bsplus-modal-btn-cancel">Cancel</button>
+          <button class="bsplus-modal-btn-danger">Delete</button>
+        </div>
+      `;
+      overlay.appendChild(modal);
+
+      const remove = () => {
+        overlay.remove();
+        document.removeEventListener("keydown", onKey);
+      };
+
+      const onKey = (e: KeyboardEvent) => {
+        if (e.key === "Escape") remove();
+      };
+
+      overlay.addEventListener("click", (e) => {
+        if (e.target === overlay) remove();
+      });
+      modal.querySelector(".bsplus-modal-btn-cancel")!.addEventListener("click", remove);
+      modal.querySelector(".bsplus-modal-btn-danger")!.addEventListener("click", () => {
+        onConfirm();
+        remove();
+      });
+
+      document.body.appendChild(overlay);
+      document.addEventListener("keydown", onKey);
+    };
+
+    // ── Sidebar folder UI ──
+
+    const renderSidebarFolders = () => {
+      const sidebar = document.querySelector("[class*='Viewer__sidebar___']");
+      if (!sidebar) return;
+
+      const ol = sidebar.querySelector("ol");
+      if (!ol) return;
+
+      let section = ol.querySelector(".bsplus-folders-section");
+      if (!section) {
+        section = document.createElement("div");
+        section.className = "bsplus-folders-section";
+        ol.appendChild(section);
+      }
+
+      const folders = getFolders();
+      const existingInput = section.querySelector(".bsplus-folder-input");
+      const existingColors = section.querySelector(".bsplus-folder-colors");
+
+      section.innerHTML = "";
+
+      // Header
+      const header = document.createElement("div");
+      header.className = "bsplus-folders-header";
+
+      const label = document.createElement("span");
+      label.textContent = "Folders";
+      header.appendChild(label);
+
+      const addBtn = document.createElement("button");
+      addBtn.className = "bsplus-folders-add-btn";
+      addBtn.title = "New folder";
+      addBtn.innerHTML = PLUS_SVG;
+      addBtn.addEventListener("click", (e) => {
+        e.stopPropagation();
+        showNewFolderInput(section!);
+      });
+      header.appendChild(addBtn);
+      section.appendChild(header);
+
+      // "All Messages" item
+      const allItem = document.createElement("div");
+      allItem.className = `bsplus-folder-item${activeFolderId === null ? " bsplus-folder-active" : ""}`;
+      allItem.innerHTML = `
+        <svg width="14" height="14" viewBox="0 0 24 24" style="fill: currentcolor; opacity: 0.5; flex-shrink: 0;"><path d="M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z"/></svg>
+        <span class="bsplus-folder-name">All Messages</span>
+      `;
+      allItem.addEventListener("click", () => {
+        activeFolderId = null;
+        applyFolderFilter();
+        applyBadges();
+        renderSidebarFolders();
+      });
+      section.appendChild(allItem);
+
+      // Folder items
+      for (const folder of folders) {
+        const item = document.createElement("div");
+        item.className = `bsplus-folder-item${activeFolderId === folder.id ? " bsplus-folder-active" : ""}`;
+        item.dataset.folderId = folder.id;
+
+        const dot = document.createElement("div");
+        dot.className = "bsplus-folder-dot";
+        dot.style.background = folder.color;
+        item.appendChild(dot);
+
+        const name = document.createElement("span");
+        name.className = "bsplus-folder-name";
+        name.textContent = folder.name;
+        item.appendChild(name);
+
+        const actions = document.createElement("div");
+        actions.className = "bsplus-folder-actions";
+
+        const editBtn = document.createElement("button");
+        editBtn.className = "bsplus-folder-action-btn";
+        editBtn.title = "Rename";
+        editBtn.innerHTML = EDIT_SVG;
+        editBtn.addEventListener("click", (e) => {
+          e.stopPropagation();
+          showEditFolderInput(section!, folder);
+        });
+        actions.appendChild(editBtn);
+
+        const deleteBtn = document.createElement("button");
+        deleteBtn.className = "bsplus-folder-action-btn";
+        deleteBtn.title = "Delete";
+        deleteBtn.innerHTML = TRASH_SVG;
+        deleteBtn.addEventListener("click", (e) => {
+          e.stopPropagation();
+          showConfirmModal(
+            "Delete folder",
+            `Remove "${folder.name}"? Messages won't be deleted.`,
+            () => {
+              const folders = getFolders().filter((f) => f.id !== folder.id);
+              saveFolders(folders);
+              const assignments = getAssignments();
+              delete assignments[folder.id];
+              saveAssignments(assignments);
+              if (activeFolderId === folder.id) activeFolderId = null;
+              applyFolderFilter();
+              applyBadges();
+              renderSidebarFolders();
+            },
+          );
+        });
+        actions.appendChild(deleteBtn);
+
+        item.appendChild(actions);
+
+        const count = document.createElement("span");
+        count.className = "bsplus-folder-count";
+        const c = getFolderMessageCount(folder.id);
+        count.textContent = c > 0 ? String(c) : "";
+        item.appendChild(count);
+
+        item.addEventListener("click", () => {
+          activeFolderId = folder.id;
+          applyFolderFilter();
+          applyBadges();
+          renderSidebarFolders();
+        });
+
+        section.appendChild(item);
+      }
+
+      // Restore input if it was open
+      if (existingInput || existingColors) {
+        // Don't restore – let user re-trigger
+      }
+    };
+
+    const showNewFolderInput = (container: Element, editFolder?: Folder) => {
+      const existing = container.querySelector(".bsplus-folder-input");
+      if (existing) existing.remove();
+      container.querySelector(".bsplus-folder-colors")?.remove();
+
+      let selectedColor = editFolder?.color ?? FOLDER_COLORS[Math.floor(Math.random() * FOLDER_COLORS.length)];
+
+      const row = document.createElement("div");
+      row.className = "bsplus-folder-input";
+
+      const input = document.createElement("input");
+      input.type = "text";
+      input.placeholder = editFolder ? "Rename folder…" : "Folder name…";
+      input.value = editFolder?.name ?? "";
+      input.maxLength = 30;
+
+      const confirmBtn = document.createElement("button");
+      confirmBtn.className = "bsplus-folder-input-confirm";
+      confirmBtn.innerHTML = CHECK_SVG_WHITE;
+
+      const cancelBtn = document.createElement("button");
+      cancelBtn.className = "bsplus-folder-input-cancel";
+      cancelBtn.innerHTML = CLOSE_SVG;
+
+      row.appendChild(input);
+      row.appendChild(confirmBtn);
+      row.appendChild(cancelBtn);
+
+      // Color picker
+      const colorRow = document.createElement("div");
+      colorRow.className = "bsplus-folder-colors";
+      for (const color of FOLDER_COLORS) {
+        const swatch = document.createElement("button");
+        swatch.className = `bsplus-folder-color-opt${color === selectedColor ? " bsplus-color-selected" : ""}`;
+        swatch.style.background = color;
+        swatch.addEventListener("click", (e) => {
+          e.stopPropagation();
+          selectedColor = color;
+          colorRow.querySelectorAll(".bsplus-folder-color-opt").forEach((s) =>
+            s.classList.toggle("bsplus-color-selected", (s as HTMLElement).style.background === color),
+          );
+        });
+        colorRow.appendChild(swatch);
+      }
+
+      const confirm = () => {
+        const name = input.value.trim();
+        if (!name) return;
+
+        if (editFolder) {
+          const folders = getFolders().map((f) =>
+            f.id === editFolder.id ? { ...f, name, color: selectedColor } : f,
+          );
+          saveFolders(folders);
+        } else {
+          const folder: Folder = { id: generateId(), name, color: selectedColor };
+          saveFolders([...getFolders(), folder]);
+        }
+        applyBadges();
+        renderSidebarFolders();
+      };
+
+      confirmBtn.addEventListener("click", (e) => {
+        e.stopPropagation();
+        confirm();
+      });
+      cancelBtn.addEventListener("click", (e) => {
+        e.stopPropagation();
+        renderSidebarFolders();
+      });
+      input.addEventListener("keydown", (e) => {
+        if (e.key === "Enter") confirm();
+        if (e.key === "Escape") renderSidebarFolders();
+      });
+
+      container.appendChild(row);
+      container.appendChild(colorRow);
+      requestAnimationFrame(() => input.focus());
+    };
+
+    const showEditFolderInput = (container: Element, folder: Folder) => {
+      showNewFolderInput(container, folder);
+    };
+
+    // ── Intercept native sidebar clicks to clear folder filter ──
+
+    const attachNativeSidebarListeners = () => {
+      const sidebar = document.querySelector("[class*='Viewer__sidebar___']");
+      if (!sidebar) return;
+
+      const ol = sidebar.querySelector("ol");
+      if (!ol) return;
+
+      ol.addEventListener("click", (e) => {
+        const target = e.target as HTMLElement;
+        if (target.closest(".bsplus-folders-section")) return;
+
+        const li = target.closest("li");
+        if (li && ol.contains(li)) {
+          if (activeFolderId !== null) {
+            activeFolderId = null;
+            applyFolderFilter();
+            applyBadges();
+            renderSidebarFolders();
+          }
+        }
+      });
+    };
+
+    // ── "Add to folder" button in message action bar ──
+
+    const injectFolderButton = (actionsBar: Element) => {
+      if (actionsBar.querySelector(".bsplus-folder-btn")) return;
+
+      const wrapper = document.createElement("div");
+      wrapper.className = "bsplus-folder-btn";
+      wrapper.style.position = "relative";
+      wrapper.style.display = "inline-block";
+
+      const btn = document.createElement("button");
+      const btnClasses = actionsBar.querySelector("button")?.className ?? "";
+      btn.className = btnClasses;
+      btn.title = "Add to folder";
+      btn.innerHTML = FOLDER_ICON_SVG;
+
+      btn.addEventListener("click", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+        closeDropdown();
+
+        const selectedMsg = document.querySelector("[class*='MessageList__selected___']");
+        const messageId = selectedMsg?.getAttribute("data-message");
+        if (!messageId) return;
+
+        showFolderDropdown(wrapper, messageId);
+      });
+
+      wrapper.appendChild(btn);
+
+      const moreMenu = actionsBar.querySelector("[class*='MenuButton__Menu___']");
+      if (moreMenu) {
+        actionsBar.insertBefore(wrapper, moreMenu);
+      } else {
+        actionsBar.appendChild(wrapper);
+      }
+    };
+
+    const showFolderDropdown = (anchor: HTMLElement, messageId: string) => {
+      const dropdown = document.createElement("div");
+      dropdown.className = "bsplus-folder-dropdown";
+
+      const folders = getFolders();
+      const currentFolderIds = getMessageFolderIds(messageId);
+
+      if (folders.length === 0) {
+        const empty = document.createElement("div");
+        empty.className = "bsplus-folder-dropdown-empty";
+        empty.textContent = "No folders yet";
+        dropdown.appendChild(empty);
+      } else {
+        for (const folder of folders) {
+          const isChecked = currentFolderIds.includes(folder.id);
+          const item = document.createElement("button");
+          item.className = `bsplus-folder-dropdown-item${isChecked ? " bsplus-checked" : ""}`;
+
+          const check = document.createElement("div");
+          check.className = "bsplus-folder-dropdown-check";
+          check.style.borderColor = isChecked ? folder.color : "";
+          check.style.background = isChecked ? folder.color : "";
+          check.innerHTML = CHECK_SVG_WHITE;
+
+          const dot = document.createElement("div");
+          dot.className = "bsplus-folder-dot";
+          dot.style.background = folder.color;
+
+          const name = document.createElement("span");
+          name.textContent = folder.name;
+
+          item.appendChild(check);
+          item.appendChild(dot);
+          item.appendChild(name);
+
+          item.addEventListener("click", (e) => {
+            e.stopPropagation();
+            toggleMessageInFolder(messageId, folder.id);
+
+            const nowChecked = getMessageFolderIds(messageId).includes(folder.id);
+            item.classList.toggle("bsplus-checked", nowChecked);
+            check.style.borderColor = nowChecked ? folder.color : "";
+            check.style.background = nowChecked ? folder.color : "";
+
+            applyBadges();
+            applyFolderFilter();
+            renderSidebarFolders();
+          });
+
+          dropdown.appendChild(item);
+        }
+      }
+
+      anchor.appendChild(dropdown);
+      openDropdown = dropdown;
+
+      dropdownCloseHandler = (e: MouseEvent) => {
+        if (!dropdown.contains(e.target as Node) && !anchor.contains(e.target as Node)) {
+          closeDropdown();
+        }
+      };
+      setTimeout(() => {
+        document.addEventListener("click", dropdownCloseHandler!, true);
+      }, 0);
+    };
+
+    const closeDropdown = () => {
+      if (openDropdown) {
+        openDropdown.remove();
+        openDropdown = null;
+      }
+      if (dropdownCloseHandler) {
+        document.removeEventListener("click", dropdownCloseHandler, true);
+        dropdownCloseHandler = null;
+      }
+    };
+
+    // ── Message badges ──
+
+    const applyBadges = () => {
+      const messageItems = document.querySelectorAll("[class*='MessageList__MessageList___'] ol > li[data-message]");
+
+      if (!shouldShowBadgesInList()) {
+        for (const li of messageItems) {
+          const subject = li.querySelector("[class*='MessageList__subject___']");
+          if (subject && (subject.querySelector(".bsplus-msg-badges") || subject.querySelector(".bsplus-subject-text"))) {
+            restoreSubjectPlain(subject);
+          } else {
+            li.querySelector(".bsplus-msg-badges")?.remove();
+          }
+        }
+        return;
+      }
+
+      const folders = getFolders();
+      const assignments = getAssignments();
+
+      for (const li of messageItems) {
+        const msgId = li.getAttribute("data-message");
+        if (!msgId) continue;
+
+        let badgeContainer = li.querySelector(".bsplus-msg-badges") as HTMLElement | null;
+
+        const folderIds = [];
+        for (const [fId, mIds] of Object.entries(assignments)) {
+          if (mIds.includes(msgId)) folderIds.push(fId);
+        }
+
+        if (folderIds.length === 0) {
+          badgeContainer?.remove();
+          continue;
+        }
+
+        if (!badgeContainer) {
+          badgeContainer = document.createElement("div");
+          badgeContainer.className = "bsplus-msg-badges";
+          const subject = li.querySelector("[class*='MessageList__subject___']");
+          if (subject) {
+            if (!subject.querySelector(".bsplus-subject-text")) {
+              const textWrap = document.createElement("span");
+              textWrap.className = "bsplus-subject-text";
+              textWrap.textContent = subject.textContent;
+              subject.textContent = "";
+              subject.appendChild(textWrap);
+            }
+            subject.appendChild(badgeContainer);
+          } else {
+            li.appendChild(badgeContainer);
+          }
+        }
+
+        badgeContainer.innerHTML = "";
+        for (const fId of folderIds) {
+          const folder = folders.find((f) => f.id === fId);
+          if (!folder) continue;
+          const badge = document.createElement("span");
+          badge.className = "bsplus-msg-badge";
+          badge.style.background = folder.color;
+          badge.textContent = folder.name;
+          badge.title = `Filter by "${folder.name}"`;
+          badge.addEventListener("click", (e) => {
+            e.stopPropagation();
+            activeFolderId = folder.id;
+            applyFolderFilter();
+            applyBadges();
+            renderSidebarFolders();
+          });
+          badgeContainer.appendChild(badge);
+        }
+      }
+    };
+
+    // ── Folder filtering ──
+
+    const applyFolderFilter = () => {
+      const messageItems = document.querySelectorAll("[class*='MessageList__MessageList___'] ol > li[data-message]");
+      const moreBtn = document.querySelector("[class*='MessageList__MessageList___'] ol > button");
+
+      if (activeFolderId === null) {
+        if (api.settings.hideFolderedMessagesInAll) {
+          for (const li of messageItems) {
+            const msgId = li.getAttribute("data-message");
+            if (msgId && isMessageInAnyCustomFolder(msgId)) {
+              li.classList.add("bsplus-folder-hidden");
+            } else {
+              li.classList.remove("bsplus-folder-hidden");
+            }
+          }
+        } else {
+          for (const li of messageItems) {
+            li.classList.remove("bsplus-folder-hidden");
+          }
+        }
+        if (moreBtn) (moreBtn as HTMLElement).classList.remove("bsplus-folder-hidden");
+        return;
+      }
+
+      const folderMsgIds = getAssignments()[activeFolderId] ?? [];
+
+      for (const li of messageItems) {
+        const msgId = li.getAttribute("data-message");
+        if (msgId && folderMsgIds.includes(msgId)) {
+          li.classList.remove("bsplus-folder-hidden");
+        } else {
+          li.classList.add("bsplus-folder-hidden");
+        }
+      }
+      if (moreBtn) (moreBtn as HTMLElement).classList.add("bsplus-folder-hidden");
+    };
+
+    // ── Observers ──
+
+    const setupMessageListObserver = () => {
+      const messageList = document.querySelector("[class*='MessageList__MessageList___'] ol");
+      if (!messageList || messageListObserver) return;
+
+      messageListObserver = new MutationObserver(() => {
+        applyBadges();
+        applyFolderFilter();
+      });
+      messageListObserver.observe(messageList, { childList: true, subtree: false });
+    };
+
+    const setupActionsObserver = () => {
+      if (actionsObserver) return;
+
+      const target = document.querySelector("[class*='Viewer__Viewer___']") ?? document.querySelector("div.messages");
+      if (!target) return;
+
+      actionsObserver = new MutationObserver(() => {
+        const actionsBar = document.querySelector("[class*='Message__actions___']");
+        if (actionsBar && !actionsBar.querySelector(".bsplus-folder-btn")) {
+          injectFolderButton(actionsBar);
+        }
+      });
+      actionsObserver.observe(target, { childList: true, subtree: true });
+    };
+
+    // ── Main page handler ──
+
+    const handleMessagesPage = async () => {
+      await waitForElm("[class*='Viewer__sidebar___'] ol", true, 50, 100);
+
+      renderSidebarFolders();
+      attachNativeSidebarListeners();
+
+      await waitForElm("[class*='MessageList__MessageList___'] ol", true, 50, 100);
+      applyBadges();
+      applyFolderFilter();
+      setupMessageListObserver();
+
+      // The actions bar only exists when a message is selected/open,
+      // so we observe the whole viewer for it to appear dynamically
+      setupActionsObserver();
+
+      // If a message is already selected, inject immediately
+      const actionsBar = document.querySelector("[class*='Message__actions___']");
+      if (actionsBar) injectFolderButton(actionsBar);
+
+      // Re-observe the sidebar for SEQTA re-renders
+      const sidebar = document.querySelector("[class*='Viewer__sidebar___']");
+      if (sidebar && !sidebarObserver) {
+        sidebarObserver = new MutationObserver(() => {
+          const ol = sidebar.querySelector("ol");
+          if (ol && !ol.querySelector(".bsplus-folders-section")) {
+            renderSidebarFolders();
+            attachNativeSidebarListeners();
+          }
+        });
+        sidebarObserver.observe(sidebar, { childList: true, subtree: true });
+      }
+    };
+
+    // ── Lifecycle ──
+
+    const mountUnsub = api.seqta.onMount("div.messages", handleMessagesPage);
+    unregisters.push(mountUnsub);
+
+    unregisters.push(
+      api.settings.onChange("showTagsInAllMessages", () => {
+        applyBadges();
+      }),
+    );
+    unregisters.push(
+      api.settings.onChange("hideFolderedMessagesInAll", () => {
+        applyFolderFilter();
+      }),
+    );
+
+    return () => {
+      for (const u of unregisters) u.unregister();
+      messageListObserver?.disconnect();
+      sidebarObserver?.disconnect();
+      actionsObserver?.disconnect();
+      closeDropdown();
+      styleEl.remove();
+      document.querySelectorAll(".bsplus-folders-section").forEach((el) => el.remove());
+      document.querySelectorAll(".bsplus-folder-btn").forEach((el) => el.remove());
+      document.querySelectorAll(".bsplus-msg-badges").forEach((el) => el.remove());
+      document.querySelectorAll("[class*='MessageList__subject___']").forEach((subject) => {
+        if (subject.querySelector(".bsplus-subject-text")) {
+          restoreSubjectPlain(subject);
+        }
+      });
+      document.querySelectorAll(".bsplus-folder-hidden").forEach((el) =>
+        el.classList.remove("bsplus-folder-hidden"),
+      );
+      document.querySelectorAll(".bsplus-modal-overlay").forEach((el) => el.remove());
+    };
+  },
+};
+
+export default messageFoldersPlugin;

src/plugins/built-in/messageFolders/styles.css

@@ -0,0 +1,491 @@
+/* ── Sidebar folder section ── */
+.bsplus-folders-section {
+  border-top: 1px solid var(--background-secondary, rgba(128, 128, 128, 0.2));
+  margin-top: 4px;
+  padding-top: 4px;
+}
+
+.bsplus-folders-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 6px 12px 2px;
+  user-select: none;
+}
+
+.bsplus-folders-header span {
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--text-primary, #666);
+  opacity: 0.5;
+}
+
+.bsplus-folders-add-btn {
+  display: flex !important;
+  align-items: center !important;
+  justify-content: center !important;
+  width: 20px !important;
+  height: 20px !important;
+  min-width: 0 !important;
+  border: none !important;
+  background: transparent !important;
+  opacity: 0.5;
+  cursor: pointer;
+  border-radius: 4px !important;
+  padding: 0 !important;
+  margin: 0 !important;
+  transition: all 0.2s ease;
+  text-align: center !important;
+}
+
+.bsplus-folders-add-btn:hover {
+  opacity: 1;
+  background: var(--background-secondary, rgba(128, 128, 128, 0.1)) !important;
+}
+
+/* ── Folder list items ── */
+.bsplus-folder-item {
+  display: flex;
+  align-items: center;
+  padding: 6px 12px;
+  cursor: pointer;
+  transition: background 0.15s ease;
+  position: relative;
+  gap: 8px;
+  user-select: none;
+}
+
+.bsplus-folder-item:hover {
+  background: var(--theme-offset-bg-more, rgba(128, 128, 128, 0.08));
+}
+
+.bsplus-folder-item.bsplus-folder-active {
+  background: var(--theme-offset-bg-more, rgba(128, 128, 128, 0.12));
+}
+
+.bsplus-folder-item.bsplus-folder-active::before {
+  content: "";
+  position: absolute;
+  left: 0;
+  top: 0;
+  bottom: 0;
+  width: 3px;
+  background: var(--better-main, #007bff);
+  border-radius: 0 2px 2px 0;
+}
+
+.bsplus-folder-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.bsplus-folder-name {
+  font-size: 13px;
+  color: var(--text-primary, #333);
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.bsplus-folder-count {
+  font-size: 11px;
+  color: var(--text-primary, #999);
+  opacity: 0.5;
+  flex-shrink: 0;
+}
+
+.bsplus-folder-actions {
+  display: flex;
+  gap: 2px;
+  opacity: 0;
+  transition: opacity 0.15s ease;
+}
+
+.bsplus-folder-item:hover .bsplus-folder-actions {
+  opacity: 1;
+}
+
+.bsplus-folder-action-btn {
+  display: flex !important;
+  align-items: center !important;
+  justify-content: center !important;
+  width: 20px !important;
+  height: 20px !important;
+  min-width: 0 !important;
+  border: none !important;
+  background: transparent !important;
+  opacity: 0.6;
+  cursor: pointer;
+  border-radius: 4px !important;
+  padding: 0 !important;
+  margin: 0 !important;
+  transition: all 0.15s ease;
+}
+
+.bsplus-folder-action-btn:hover {
+  opacity: 1;
+  background: var(--background-secondary, rgba(128, 128, 128, 0.15)) !important;
+}
+
+/* ── Inline folder name input ── */
+.bsplus-folder-input {
+  display: flex;
+  align-items: center;
+  padding: 4px 12px;
+  gap: 6px;
+}
+
+.bsplus-folder-input input {
+  flex: 1;
+  min-width: 0;
+  padding: 4px 8px;
+  font-size: 13px;
+  border: 1px solid var(--background-secondary, #ccc);
+  border-radius: 6px;
+  background: var(--background-secondary, #f5f5f5);
+  color: var(--text-primary, #333);
+  outline: none;
+  transition: border-color 0.2s ease, box-shadow 0.2s ease;
+}
+
+.bsplus-folder-input input:focus {
+  border-color: var(--better-main, #007bff);
+  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
+}
+
+.bsplus-folder-input-confirm,
+.bsplus-folder-input-cancel {
+  display: flex !important;
+  align-items: center !important;
+  justify-content: center !important;
+  width: 24px !important;
+  height: 24px !important;
+  min-width: 0 !important;
+  border: none !important;
+  border-radius: 4px !important;
+  cursor: pointer;
+  padding: 0 !important;
+  margin: 0 !important;
+  transition: all 0.15s ease;
+}
+
+.bsplus-folder-input-confirm {
+  background: var(--better-main, #007bff) !important;
+}
+
+.bsplus-folder-input-confirm:hover {
+  transform: scale(1.1);
+}
+
+.bsplus-folder-input-cancel {
+  background: transparent !important;
+  opacity: 0.6;
+}
+
+.bsplus-folder-input-cancel:hover {
+  opacity: 1;
+  background: var(--background-secondary, rgba(128, 128, 128, 0.1)) !important;
+}
+
+/* ── Color picker row ── */
+.bsplus-folder-colors {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 6px;
+  padding: 4px 12px 6px;
+  max-width: 120px;
+}
+
+.bsplus-folder-color-opt {
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  border: 2px solid transparent;
+  cursor: pointer;
+  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
+              border-color 0.2s ease,
+              box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
+  padding: 0;
+  background: none;
+  box-sizing: border-box;
+}
+
+.bsplus-folder-color-opt:hover {
+  transform: scale(1.25);
+  box-shadow: 0 0 0 3px rgba(128, 128, 128, 0.15);
+}
+
+.bsplus-folder-color-opt.bsplus-color-selected {
+  border-color: var(--text-primary, #333);
+  transform: scale(1.15);
+  box-shadow: 0 0 0 3px rgba(128, 128, 128, 0.2);
+}
+
+.bsplus-folder-color-opt.bsplus-color-selected:hover {
+  transform: scale(1.25);
+}
+
+/* ── "Add to folder" button in message actions bar ── */
+.bsplus-folder-btn {
+  position: relative;
+}
+
+.bsplus-folder-btn svg {
+  fill: currentColor;
+}
+
+/* ── Folder dropdown ── */
+.bsplus-folder-dropdown {
+  position: absolute;
+  top: 100%;
+  right: 0;
+  margin-top: 4px;
+  min-width: 180px;
+  background: var(--background-primary, #fff);
+  border: 1px solid var(--background-secondary, #e0e0e0);
+  border-radius: 8px;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
+  z-index: 1000;
+  overflow: hidden;
+  animation: bsplus-dropdown-in 0.15s ease-out;
+}
+
+@keyframes bsplus-dropdown-in {
+  from {
+    opacity: 0;
+    transform: translateY(-4px) scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.bsplus-folder-dropdown-item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 12px;
+  cursor: pointer;
+  transition: background 0.1s ease;
+  border: none;
+  background: transparent;
+  width: 100%;
+  text-align: left;
+  color: var(--text-primary, #333);
+  font-size: 13px;
+}
+
+.bsplus-folder-dropdown-item:hover {
+  background: var(--theme-offset-bg-more, rgba(128, 128, 128, 0.08));
+}
+
+.bsplus-folder-dropdown-check {
+  width: 16px;
+  height: 16px;
+  border: 2px solid var(--background-secondary, #ccc);
+  border-radius: 4px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  transition: all 0.15s ease;
+}
+
+.bsplus-folder-dropdown-item.bsplus-checked .bsplus-folder-dropdown-check {
+  background: var(--better-main, #007bff);
+  border-color: var(--better-main, #007bff);
+}
+
+.bsplus-folder-dropdown-check svg {
+  width: 10px;
+  height: 10px;
+  color: white;
+  opacity: 0;
+  transition: opacity 0.1s ease;
+}
+
+.bsplus-folder-dropdown-item.bsplus-checked .bsplus-folder-dropdown-check svg {
+  opacity: 1;
+}
+
+.bsplus-folder-dropdown-empty {
+  padding: 12px;
+  text-align: center;
+  font-size: 12px;
+  color: var(--text-primary, #999);
+  opacity: 0.5;
+}
+
+/* ── Let primary column use available space instead of being clipped ── */
+[class*='MessageList__primary___'] {
+  flex: 1 1 0% !important;
+  min-width: 0 !important;
+  overflow: hidden !important;
+}
+
+/* ── Make subject line a flex row so badges sit inline ── */
+[class*='MessageList__subject___'] {
+  display: flex !important;
+  align-items: center;
+  gap: 6px;
+  min-width: 0 !important;
+  overflow: hidden !important;
+}
+
+/* ── Subject text truncates to make room for badges ── */
+.bsplus-subject-text {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  min-width: 0;
+  flex: 1 1 auto;
+}
+
+/* ── Shrink the secondary column to its content ── */
+[class*='MessageList__secondary___'] {
+  flex: 0 0 auto !important;
+  width: auto !important;
+  min-width: 0 !important;
+  max-width: 200px !important;
+}
+
+/* ── Constrain the flags/attachment icon column ── */
+[class*='MessageList__flags___'] {
+  width: 24px !important;
+  min-width: 0 !important;
+  flex-shrink: 0 !important;
+}
+
+/* ── Message list folder badges ── */
+.bsplus-msg-badges {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  flex-shrink: 0;
+  margin-left: auto;
+}
+
+.bsplus-msg-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  padding: 1px 6px;
+  border-radius: 8px;
+  font-size: 10px;
+  font-weight: 500;
+  line-height: 1.4;
+  color: white;
+  white-space: nowrap;
+  cursor: pointer;
+  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.bsplus-msg-badge:hover {
+  opacity: 0.85;
+  transform: scale(1.05);
+}
+
+/* ── Folder filtering (hide messages not in active folder) ── */
+.bsplus-folder-hidden {
+  display: none !important;
+}
+
+/* ── Delete confirmation modal ── */
+@keyframes bsplus-modal-overlay-in {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+@keyframes bsplus-modal-in {
+  from {
+    opacity: 0;
+    transform: scale(0.95) translateY(-8px);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1) translateY(0);
+  }
+}
+
+.bsplus-modal-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 2147483647;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  background: rgba(0, 0, 0, 0.5);
+  backdrop-filter: blur(4px);
+  animation: bsplus-modal-overlay-in 0.2s ease-out forwards;
+}
+
+.bsplus-modal {
+  padding: 1rem 1.5rem;
+  margin: 0 1rem;
+  min-width: 16rem;
+  max-width: 22rem;
+  width: 100%;
+  box-sizing: border-box;
+  background: var(--background-primary, #fff);
+  border-radius: 0.75rem;
+  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
+  border: 1px solid var(--background-secondary, #e0e0e0);
+  animation: bsplus-modal-in 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
+}
+
+.bsplus-modal h3 {
+  margin: 0 0 0.5rem;
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--text-primary, #333);
+}
+
+.bsplus-modal p {
+  margin: 0 0 1rem;
+  font-size: 0.875rem;
+  color: var(--text-primary, #666);
+  opacity: 0.8;
+}
+
+.bsplus-modal-actions {
+  display: flex;
+  gap: 0.75rem;
+  justify-content: flex-end;
+}
+
+.bsplus-modal-actions button {
+  padding: 0.4rem 1rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  border-radius: 0.5rem;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.bsplus-modal-btn-cancel {
+  background: transparent;
+  border: 1px solid var(--background-secondary, #ccc);
+  color: var(--text-primary, #333);
+}
+
+.bsplus-modal-btn-cancel:hover {
+  background: var(--background-secondary, rgba(128, 128, 128, 0.1));
+}
+
+.bsplus-modal-btn-danger {
+  background: #e53e3e;
+  border: none;
+  color: white;
+}
+
+.bsplus-modal-btn-danger:hover {
+  background: #c53030;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 12px rgba(229, 62, 62, 0.35);
+}

src/plugins/built-in/themes/index.ts

@@ -10,6 +10,7 @@ const themesPlugin: Plugin = {
 
   run: async (_) => {
     const themeManager = ThemeManager.getInstance();
+    await themeManager.prepareThemeAfterCloudSync();
     await themeManager.initialize();
   },
 };

src/plugins/built-in/themes/theme-manager.ts

@@ -6,6 +6,7 @@ import {
   type LoadedCustomTheme,
   shouldForceThemeAppearance,
 } from "@/types/CustomThemes";
+import { BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY } from "@/seqta/utils/cloudSettingsSync";
 import { settingsState } from "@/seqta/utils/listeners/SettingsState";
 import debounce from "@/seqta/utils/debounce";
 import { themeUpdates } from "@/interface/hooks/ThemeUpdates";
@@ -166,6 +167,33 @@ export class ThemeManager {
     }
   }
 
+  /**
+   * After cloud restore, IndexedDB/theme storage is only reachable from page context (not MV3 SW).
+   * Background sets BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY; we fetch the store JSON here before setTheme().
+   * The resolved id matches cloud sync **`themeId` / `selectedTheme`**: it may be a standard theme uuid or a
+   * flavour (slave) variant id — **`downloadAndInstallStoreTheme`** is the same code path as the theme store installer.
+   */
+  public async prepareThemeAfterCloudSync(): Promise<void> {
+    try {
+      const snap = await browser.storage.local.get(BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY);
+      const pending = snap[BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY];
+      if (pending === undefined) return;
+
+      await browser.storage.local.remove(BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY);
+
+      if (typeof pending !== "string") return;
+      const id = pending.trim();
+      if (!id) return;
+
+      const existing = (await localforage.getItem(id)) as CustomTheme | null;
+      if (existing) return;
+
+      await this.downloadAndInstallStoreTheme({ id, name: id });
+    } catch (e) {
+      console.warn("[ThemeManager] prepareThemeAfterCloudSync:", e);
+    }
+  }
+
   /**
    * Initialize the theme system and restore previous state
    */

src/plugins/index.ts

@@ -10,6 +10,7 @@ import assessmentsAveragePlugin from "./built-in/assessmentsAverage";
 import profilePicturePlugin from "./built-in/profilePicture";
 import assessmentsOverviewPlugin from "./built-in/assessmentsOverview";
 import backgroundMusicPlugin from "./built-in/backgroundMusic";
+import messageFoldersPlugin from "./built-in/messageFolders";
 //import testPlugin from './built-in/test';
 
 // Heavy plugins (lazy-loaded only when enabled)
@@ -28,6 +29,7 @@ pluginManager.registerPlugin(timetableEditPlugin);
 pluginManager.registerPlugin(profilePicturePlugin);
 pluginManager.registerPlugin(assessmentsOverviewPlugin);
 pluginManager.registerPlugin(backgroundMusicPlugin);
+pluginManager.registerPlugin(messageFoldersPlugin);
 //pluginManager.registerPlugin(testPlugin);
 
 // Register heavy plugins with lazy loading

src/seqta/utils/Loaders/LoadHomePage.ts

@@ -113,7 +113,16 @@ export async function loadHomePage() {
   callHomeTimetable(TodayFormatted, true);
 
   const activeClass = classes.find((c: any) => c.hasOwnProperty("active"));
-  const activeSubjects = activeClass?.subjects || [];
+  const activeYear = activeClass?.year;
+  const allSubjectsInYear = classes
+    .filter((c: any) => c.year === activeYear)
+    .flatMap((c: any) => c.subjects || []);
+  const seen = new Set<string>();
+  const activeSubjects = allSubjectsInYear.filter((s: any) => {
+    if (seen.has(s.code)) return false;
+    seen.add(s.code);
+    return true;
+  });
   const activeSubjectCodes = activeSubjects.map((s: any) => s.code);
   const currentAssessments = assessments
     .filter((a: any) => activeSubjectCodes.includes(a.code))

src/seqta/utils/Openers/OpenWhatsNewPopup.ts

@@ -35,10 +35,16 @@ export function OpenWhatsNewPopup(onDismissed?: () => void) {
     <div class="whatsnewTextContainer" style="height: 50%;overflow-y: auto;">
 
 
-      <h1>3.6.4 - Patch for alpine theme</h1>
+      <h1>3.6.4 - DM Folders, Theme falvours and fixes, Upcoming Assements improvement</h1>
-      <li>Added single channel adaptive CSS variables (r/g/b)</li>
+      <li>Added advanced colour adjustments variables for theme customisation.</li>
+      <li>Improved logic for upcoming assements dashlet to improve compatibility.</li>
+      <li>BS Cloud can now automatically download themes from other devices.</li>
+      <li>Added theme flavour's for multiple colour variations of the same theme.</li>
+      <li>Added custom message folder, customizable in settings.</li>
+      
       <h1>3.6.3 - Assessment overview fix</h1>
       <li>Fixed assessments overview failing to load.</li>
+      
       <h1>3.6.2 - Cloud backup, various fixes & SEQTA Engage support</h1>
       <li>BetterSEQTA Cloud: back up and restore extension settings from your account (General settings).</li>
       <li>Optional automatic cloud sync if signed in (on by default).</li>
@@ -52,6 +58,7 @@ export function OpenWhatsNewPopup(onDismissed?: () => void) {
       <li>Updated outdated in-app links and update some under the hood code (Vite 8).</li>
       <li>Added a notifications panel animation to work like settings.</li>
       <li>Fix timetable edit plugin not working correctly.</li>
+      
       <h1>3.5.3 - Adaptive theme updates</h1>
       <li>Fixed adaptive theming on current-year course and assessment pages.</li>
 

src/seqta/utils/cloudSettingsSync.ts

@@ -10,6 +10,13 @@ export const CLOUD_SETTINGS_SYNC_SCHEMA_VERSION = 1;
 export const BSPLUS_CLOUD_KNOWN_REMOTE_UPDATED_AT_KEY =
   "bsplus_cloud_settings_known_remote_updated_at";
 
+/**
+ * Written by the service worker after applying a cloud settings envelope; the SEQTA page’s
+ * ThemeManager reads and clears it (SW cannot share localforage/IndexedDB with the page).
+ */
+export const BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY =
+  "bsplus_pending_theme_ensure_after_cloud";
+
 /**
  * Never uploaded to the cloud backup (OAuth and legacy keys).
  * IndexedDB (e.g. Global Search’s `betterseqta-index` database) is not part of
@@ -39,6 +46,7 @@ export const SENSITIVE_DEVICE_STORAGE_KEY_PREFIXES = ["plugin.global-search.stor
 const CLIENT_ONLY_CLOUD_KEYS_EXACT = [
   BSPLUS_CLOUD_KNOWN_REMOTE_UPDATED_AT_KEY,
   "bsplus_lastCloudPoll",
+  BSPLUS_PENDING_THEME_ENSURE_AFTER_CLOUD_KEY,
 ] as const;
 
 /** After restoring from cloud, keep local session so the user stays signed in. */
@@ -101,8 +109,15 @@ function stripExcludedKeysFromRemoteData(remote: Record<string, unknown>): Recor
   return out;
 }
 
+/** Stored theme id (`selectedTheme`); trims whitespace; empty string clears. */
+export function normalizeThemeIdForSync(raw: unknown): string {
+  if (typeof raw !== "string") return "";
+  return raw.trim();
+}
+
 export function buildUploadPayload(all: Record<string, unknown>): {
   schemaVersion: number;
+  themeId: string;
   data: Record<string, unknown>;
 } {
   const filtered: Record<string, unknown> = {};
@@ -111,17 +126,57 @@ export function buildUploadPayload(all: Record<string, unknown>): {
     filtered[k] = v;
   }
   const data = migrateLegacyToPluginSettings(filtered);
-  return { schemaVersion: CLOUD_SETTINGS_SYNC_SCHEMA_VERSION, data };
+  const themeId = normalizeThemeIdForSync(all.selectedTheme);
+  return {
+    schemaVersion: CLOUD_SETTINGS_SYNC_SCHEMA_VERSION,
+    themeId,
+    data,
+  };
 }
 
 export async function getSnapshotForUpload(): Promise<{
   schemaVersion: number;
+  themeId: string;
   data: Record<string, unknown>;
 }> {
   const all = await browser.storage.local.get();
   return buildUploadPayload(all as Record<string, unknown>);
 }
 
+/**
+ * Theme to ensure is installed locally after a downloaded envelope (explicit `themeId` overrides `data.selectedTheme`).
+ * Works for any store-backed id, including **flavour (slave) variants** nested under masters in the catalogue.
+ */
+export function resolveThemeIdForPostSyncDownload(envelope: unknown): string | undefined {
+  if (envelope && typeof envelope === "object" && "themeId" in envelope) {
+    const top = normalizeThemeIdForSync(
+      (envelope as Record<string, unknown>).themeId,
+    );
+    if (top) return top;
+  }
+
+  let remoteFlat: Record<string, unknown>;
+  if (
+    envelope &&
+    typeof envelope === "object" &&
+    "data" in envelope &&
+    (envelope as { data?: unknown }).data !== undefined &&
+    typeof (envelope as { data?: unknown }).data === "object" &&
+    (envelope as { data?: unknown }).data !== null &&
+    !Array.isArray((envelope as { data?: unknown }).data)
+  ) {
+    remoteFlat = (envelope as { data: Record<string, unknown> }).data;
+  } else if (envelope && typeof envelope === "object" && !Array.isArray(envelope)) {
+    remoteFlat = envelope as Record<string, unknown>;
+  } else {
+    return undefined;
+  }
+
+  const migrated = migrateLegacyToPluginSettings(remoteFlat);
+  const fromData = normalizeThemeIdForSync(migrated.selectedTheme);
+  return fromData === "" ? undefined : fromData;
+}
+
 export async function setKnownRemoteUpdatedAt(iso: string | undefined): Promise<void> {
   if (!iso || typeof iso !== "string") return;
   await browser.storage.local.set({ [BSPLUS_CLOUD_KNOWN_REMOTE_UPDATED_AT_KEY]: iso });