…arch

- Adds 'Encrypted Room Search' toggle to Settings > Experimental
- Setting defaults to true; operator can hard-disable via
  config.json features.encryptedSearch = false
- Lock icon shown next to encrypted rooms in the search room picker
  when the feature is active, indicating local-cache coverage
- useMessageSearch now checks both the operator flag and user setting

Removes the guard that hid the search icon in encrypted room headers.
Encrypted rooms now navigate to message search pre-filtered to that
room, showing in-memory results when the feature is enabled.
Tooltip reads "Search (local cache)" for encrypted rooms.

…abled

- Fix DM rooms missing from search: replace useRooms (excludes DMs)
  with useSelectedRooms+isRoom selector so DM room IDs pass URL param
  validation; room picker always uses the full allRooms list
- Add SearchHasType (image/file/audio/video/link) to searchEncryptedRooms.ts
  with mEventMatchesHasTypes filtering in in-memory timeline search
- Add hasTypes to MessageSearchParams; pass contains_url:true for has:link
  on server requests; post-filter server results by msgtype/URL pattern
- Add HasFilterChips and SelectSenderButton components to SearchFilters;
  new has: row with Image/File/Audio/Video/Link toggles plus From: sender
  chips with Matrix ID input popup
- Wire has URL param through MessageSearch: parse, encode, pass to
  SearchFilters and msgSearchParams; add handleHasTypesChange/handleSendersChange

- Fix mDirects undefined crash in MessageSearch (re-add atom import)
- Allow has: filters to trigger search without a text term
  - searchEncryptedRooms: skip body text check when lowerTerm is empty
  - useMessageSearch: only early-return when both term and hasTypes are absent
  - When no term: skip server search (server requires search_term), in-memory only
  - MessageSearch: enable query when hasTypes is set even without a term
- Add DM search page at /direct/search/
  - DIRECT_SEARCH_PATH constant in paths.ts
  - getDirectSearchPath() helper in pathUtils.ts
  - useDirectSearchSelected() hook in useDirectSelected.ts
  - DirectSearch component (scoped to DM rooms)
  - Route registered in Router.tsx
  - 'Message Search' nav item added to Direct Messages panel
  - RoomViewHeader: clicking search in a DM navigates to DM search

…r for from: filter

…display names; fix DM create button alignment

…o unencrypted rooms

…o DM search

Typing > in the room search modal switches to message search mode.
A 'Search messages: <query>' item appears; pressing Enter or clicking
it navigates to the context-appropriate message search page with the
term pre-filled:
- /direct/ context → DM message search
- /:spaceIdOrAlias/ context → space message search
- /home/ or other → home message search

The hint text is updated to include > for messages. The prefix is
disabled when the modal is used for room-picking (forwarding).