feat(search): sender picker, date presets, has:link filter

- Add SelectSenderButton: clickable people picker for the From filter
  replacing the text-only from:@user syntax
- Add date preset shortcuts in DateRangeButton (Today, Last week,
  Last month, Last year) for one-click range selection
- Add Has link chip backed by Matrix contains_url API filter; toggle
  removes cleanly with X badge
- Wire containsUrl through URL params, useMessageSearch hook, and
  SearchFilters props

UNTESTED — verify at chat.lotusguild.org post-deploy.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/message-search/useMessageSearch.ts

@@ -70,10 +70,11 @@ export type MessageSearchParams = {
   senders?: string[];
   fromTs?: number;
   toTs?: number;
+  containsUrl?: boolean;
 };
 export const useMessageSearch = (params: MessageSearchParams) => {
   const mx = useMatrixClient();
-  const { term, order, rooms, senders, fromTs, toTs } = params;
+  const { term, order, rooms, senders, fromTs, toTs, containsUrl } = params;
 
   const searchMessages = useCallback(
     async (nextBatch?: string) => {
@@ -96,9 +97,10 @@ export const useMessageSearch = (params: MessageSearchParams) => {
               limit,
               rooms,
               senders,
-              // from_ts / to_ts are valid Matrix spec fields not yet in SDK types
+              // from_ts / to_ts and contains_url are valid Matrix spec fields not yet in SDK types
               ...(fromTs !== undefined && { from_ts: fromTs }),
               ...(toTs !== undefined && { to_ts: toTs }),
+              ...(containsUrl !== undefined && { contains_url: containsUrl }),
               // eslint-disable-next-line @typescript-eslint/no-explicit-any
             } as any,
             include_state: false,
@@ -114,7 +116,7 @@ export const useMessageSearch = (params: MessageSearchParams) => {
       });
       return parseSearchResult(r);
     },
-    [mx, term, order, rooms, senders, fromTs, toTs],
+    [mx, term, order, rooms, senders, fromTs, toTs, containsUrl],
   );
 
   return searchMessages;