feat: theme flavours for theme varients

src/seqta/utils/Openers/OpenWhatsNewPopup.ts

@@ -35,9 +35,9 @@ export function OpenWhatsNewPopup(onDismissed?: () => void) {
     <div class="whatsnewTextContainer" style="height: 50%;overflow-y: auto;">
 
 
-      <h1>3.6.4 - Fix for alpine theme & Assement dashlet improvement</h1>
+      <h1>3.6.4 - Theme syncing, falvours, fixes & Upcoming Assement dashlet improvement</h1>
       <li>Added advanced colour adjustments variables for theme customisation.</li>
-      <li>Improved logic for assement dashlet to improve compatibility.</li>
+      <li>Improved logic for upcoming assements dashlet to improve compatibility.</li>
       <li>BS Cloud can now automatically download themes from other devices.</li>
       
       <h1>3.6.3 - Assessment overview fix</h1>

src/seqta/utils/cloudSettingsSync.ts

@@ -143,7 +143,10 @@ export async function getSnapshotForUpload(): Promise<{
   return buildUploadPayload(all as Record<string, unknown>);
 }
 
-/** Theme to ensure is installed locally after a downloaded envelope (explicit field overrides `data.selectedTheme`). */
+/**
+ * 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(