fix: fix sidebar animation weirdness in sidebar folders

src/seqta/ui/sidebar/Sidebar.svelte

@@ -195,6 +195,8 @@
   class="logo-link bsplus-sidebar-list"
   class:noscroll={sidebarState.isDrilling}
   class:drilling={sidebarState.isDrilling}
+  class:drill-entering={sidebarState.enterFrameKey != null}
+  class:drill-returning={sidebarState.drillReturning}
   class:compact={sidebarState.compact}
   class:edit-mode={sidebarState.editMode}
   class:is-sorting={dragging}
@@ -283,7 +285,8 @@
       class="sub"
       class:bsplus-sub-enter={sidebarState.enterFrameKey === current.frame.key}
       onanimationend={(e) => {
-        if (e.target === e.currentTarget) {
+        if (e.target !== e.currentTarget) return;
+        if (sidebarState.enterFrameKey === current.frame.key) {
           sidebarState.clearEnterFrame(current.frame.key);
         }
       }}

src/seqta/ui/sidebar/mountCustomSidebar.ts

@@ -101,7 +101,7 @@ function scheduleSync() {
  * never see them. Opening Goals/Folios via SEQTA + our drill UI freezes the tab.
  */
 function onCustomSidebarCaptureClick(event: MouseEvent) {
-  if (!menuEl || sidebarState.editMode) return;
+  if (!menuEl || sidebarState.editMode || sidebarState.drillReturning) return;
 
   const root = document.getElementById(ROOT_ID);
   const target = event.target;

src/seqta/ui/sidebar/sidebarState.svelte.ts

@@ -184,8 +184,9 @@ class SidebarState {
   activePath = $state("");
   editMode = $state(false);
   iconOnly = $state(false);
-  /** Frame key whose `.sub` should play the one-shot enter animation. */
+  /** Folder key playing the one-shot panel enter animation. */
   enterFrameKey = $state<string | null>(null);
+  drillReturning = $state(false);
 
   visibleRootItems = $derived(
     filterVisible(orderItems(this.items, settingsState.menuorder ?? [])),
@@ -262,10 +263,11 @@ class SidebarState {
   }
 
   openFolder(item: SidebarItem, menu?: HTMLElement) {
-    if (!item.hasChildren) return;
-    // Ignore duplicate opens (double-firing click / label + li).
+    if (!item.hasChildren || this.drillReturning) return;
     if (this.drillStack.at(-1)?.key === item.key) return;
 
+    this.drillReturning = false;
+
     const frame: SidebarDrillFrame = {
       key: item.key,
       label: item.label,
@@ -293,14 +295,23 @@ class SidebarState {
   }
 
   goBack() {
-    if (!this.drillStack.length) return;
+    if (!this.drillStack.length || this.drillReturning) return;
+
     this.enterFrameKey = null;
     this.drillStack = this.drillStack.slice(0, -1);
     resetSidebarScroll();
+
+    if (settingsState.animations !== true) return;
+
+    this.drillReturning = true;
+    window.setTimeout(() => {
+      this.drillReturning = false;
+    }, 360);
   }
 
   resetDrill() {
     this.enterFrameKey = null;
+    this.drillReturning = false;
     this.drillStack = [];
     resetSidebarScroll();
   }
@@ -350,7 +361,7 @@ class SidebarState {
   }
 
   activateItem(item: SidebarItem, menu: HTMLElement) {
-    if (this.editMode) return;
+    if (this.editMode || this.drillReturning) return;
 
     if (item.hasChildren) {
       this.openFolder(item, menu);
@@ -360,6 +371,13 @@ class SidebarState {
     this.activeKey = item.key;
     if (item.path) this.activePath = item.path;
 
+    // Already inside this folder — never replay the one-shot enter animation when
+    // SEQTA rewrites `.active` on the route change.
+    if (this.isDrilling) {
+      this.enterFrameKey = null;
+      restoreCustomMenuActive();
+    }
+
     const native = findNativeMenuEntry(menu, item);
     if (native) {
       // Clear native drill once only — repeating clearNativeDrillActive fights