fix(wave-2): audit fixes — account-data races, search-cache wipe, export, media

Web fixes from the Wave-2 bug-hunt (findings in LOTUS_TODO):
- F1 (security): wipe the decrypted-plaintext search index on SERVER-FORCED
  logout too (token expiry / remote sign-out) — only manual logout did before.
  F4: the delete no longer reports success while onblocked (waits, 3s cap).
- M1/M2 (data-loss): useBookmarks + useUserNotes account-data writes are now
  serialized at MODULE scope (single queue + latestRef per client, echo-driven),
  fixing the cross-instance lost-update clobber (useBookmarks mounts per message
  row, so a per-instance queue was insufficient — caught in review).
- M6: room-history export gets a 200-page cap + Cancel + unmount-abort +
  correct date-range early-break (raw paginated ts). M4: image compression
  skips PNG (was flattening transparency to black), bakes EXIF orientation via
  createImageBitmap, .jpg-renames, and falls back to the original on decode
  failure instead of dropping the file. M5: MediaGallery lightbox opens the
  right item (shared thumb guard). M8: audio speed survives async decrypt.
- Desktop web wiring: D2 badge sums leaf rooms only (space double-count, like
  the favicon fix); D3 useTauriDnd re-hydrates from get_tray_dnd on mount; D5
  updater has a terminal state.

Reviewed; M7 reverted (past-time clamp is an intentional, tested contract).
tsc/eslint/prettier clean, build OK, 678 tests.

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

src/app/features/room/RoomInput.tsx

@@ -456,12 +456,16 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
 
             if (compressionResult) {
               const originalFile = fileItem.originalFile as File;
-              const compressedFile = new File([compressionResult.blob], originalFile.name, {
-                type: 'image/jpeg',
+              // compressImage re-encodes as JPEG; swap the extension so the file
+              // name and MIME type agree (avoids e.g. a JPEG named "photo.png").
+              const compressedType = compressionResult.type;
+              const compressedName = `${originalFile.name.replace(/\.[^./\\]+$/, '')}.jpg`;
+              const compressedFile = new File([compressionResult.blob], compressedName, {
+                type: compressedType,
               });
               const uploadRes = await mx.uploadContent(compressedFile, {
-                name: originalFile.name,
-                type: 'image/jpeg',
+                name: compressedName,
+                type: compressedType,
               });
               const compressedMxc = (uploadRes as { content_uri: string }).content_uri;
               if (compressedMxc) {