fix(desktop): address code-review findings on the desktop wave

- fileEntries: a single unreadable file/dir in a dropped folder no longer aborts
  the whole traversal (try/catch per entry, skip failures) — was discarding ALL
  dropped files (incl. the flat-file path) + an unhandled rejection; also add
  .catch in both useFileDrop consumers.
- RoomInput: mirror a localStorage-restored draft into the draft atom so the
  P5-57 indicator reflects a persisted draft after a page reload, not only on
  same-session room re-entry.
- useTauriThumbbar: swallow toggleMicrophone()/hangup() rejections (parity with
  SMTC) — avoids an unhandled rejection when clicked mid-teardown.
- App/DesktopChrome: keep wrapper element types stable across the chrome toggle
  (display:contents when off) so flipping it no longer remounts RouterProvider.
- settings: normalizeComposerToolbarOrder also appends missing keys from the
  canonical key set (safety net if a new button is absent from the default order).

Gates: tsc/eslint/prettier clean, build OK, 559 tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/hooks/useFileDrop.ts

@@ -6,9 +6,11 @@ export const useFileDropHandler = (onDrop: (file: File[]) => void): DragEventHan
     (evt) => {
       // `collectDroppedFiles` synchronously captures the entry list from the
       // DataTransfer before traversing folders asynchronously.
-      collectDroppedFiles(evt.dataTransfer).then((files) => {
-        if (files) onDrop(files);
-      });
+      collectDroppedFiles(evt.dataTransfer)
+        .then((files) => {
+          if (files) onDrop(files);
+        })
+        .catch(() => undefined);
     },
     [onDrop],
   );
@@ -30,9 +32,11 @@ export const useFileDropZone = (
       // Capture entries synchronously (inside the event) then traverse any
       // dropped folders asynchronously — the DataTransferItemList is emptied
       // once this handler returns.
-      collectDroppedFiles(evt.dataTransfer).then((files) => {
-        if (files) onDrop(files);
-      });
+      collectDroppedFiles(evt.dataTransfer)
+        .then((files) => {
+          if (files) onDrop(files);
+        })
+        .catch(() => undefined);
     };
 
     target?.addEventListener('drop', handleDrop);