feat(web): add message search modal (chat/global)

- add Search action in chat header
- support search in active chat or globally when no chat selected
- show searchable message results and jump to target chat on click

web/src/pages/ChatsPage.tsx

@@ -3,6 +3,8 @@ import { ChatList } from "../components/ChatList";
 import { ChatInfoPanel } from "../components/ChatInfoPanel";
 import { MessageComposer } from "../components/MessageComposer";
 import { MessageList } from "../components/MessageList";
+import { searchMessages } from "../api/chats";
+import type { Message } from "../chat/types";
 import { useRealtime } from "../hooks/useRealtime";
 import { useAuthStore } from "../store/authStore";
 import { useChatStore } from "../store/chatStore";
@@ -19,6 +21,10 @@ export function ChatsPage() {
   const activeChat = chats.find((chat) => chat.id === activeChatId);
   const isReadOnlyChannel = Boolean(activeChat && activeChat.type === "channel" && activeChat.my_role === "member");
   const [infoOpen, setInfoOpen] = useState(false);
+  const [searchOpen, setSearchOpen] = useState(false);
+  const [searchQuery, setSearchQuery] = useState("");
+  const [searchLoading, setSearchLoading] = useState(false);
+  const [searchResults, setSearchResults] = useState<Message[]>([]);
 
   useRealtime();
 
@@ -32,6 +38,39 @@ export function ChatsPage() {
     }
   }, [activeChatId, loadMessages]);
 
+  useEffect(() => {
+    if (!searchOpen) {
+      return;
+    }
+    const term = searchQuery.trim();
+    if (term.length < 2) {
+      setSearchResults([]);
+      setSearchLoading(false);
+      return;
+    }
+    let cancelled = false;
+    setSearchLoading(true);
+    void (async () => {
+      try {
+        const found = await searchMessages(term, activeChatId ?? undefined);
+        if (!cancelled) {
+          setSearchResults(found);
+        }
+      } catch {
+        if (!cancelled) {
+          setSearchResults([]);
+        }
+      } finally {
+        if (!cancelled) {
+          setSearchLoading(false);
+        }
+      }
+    })();
+    return () => {
+      cancelled = true;
+    };
+  }, [searchOpen, searchQuery, activeChatId]);
+
   return (
     <main className="h-screen w-full p-2 text-text md:p-4">
       <div className="mx-auto flex h-full max-w-[1500px] gap-2 md:gap-4">
@@ -55,10 +94,15 @@ export function ChatsPage() {
                 <p className="truncate text-xs text-slate-300/80">{activeChat ? headerMetaLabel(activeChat) : "Select a chat"}</p>
               </div>
             </div>
+            <div className="flex items-center gap-2">
+              <button className="rounded-full bg-slate-700/70 px-3 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={() => setSearchOpen(true)}>
+                Search
+              </button>
               <button className="rounded-full bg-slate-700/70 px-3 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={logout}>
                 Logout
               </button>
             </div>
+          </div>
           <div className="min-h-0 flex-1">
             <MessageList />
           </div>
@@ -76,6 +120,41 @@ export function ChatsPage() {
         </section>
       </div>
       <ChatInfoPanel chatId={activeChatId} open={infoOpen} onClose={() => setInfoOpen(false)} />
+      {searchOpen ? (
+        <div className="fixed inset-0 z-[130] flex items-start justify-center bg-slate-950/60 p-3 md:p-6" onClick={() => setSearchOpen(false)}>
+          <div className="w-full max-w-xl rounded-2xl border border-slate-700/80 bg-slate-900 p-3 shadow-2xl" onClick={(e) => e.stopPropagation()}>
+            <div className="mb-2 flex items-center justify-between">
+              <p className="text-sm font-semibold">Search messages</p>
+              <button className="rounded bg-slate-700 px-2 py-1 text-xs" onClick={() => setSearchOpen(false)}>Close</button>
+            </div>
+            <input
+              className="mb-2 w-full rounded-xl border border-slate-700/80 bg-slate-800/80 px-3 py-2 text-sm outline-none placeholder:text-slate-400 focus:border-sky-500"
+              placeholder={activeChatId ? "Search in current chat..." : "Global search..."}
+              value={searchQuery}
+              onChange={(e) => setSearchQuery(e.target.value)}
+            />
+            {searchLoading ? <p className="px-2 py-1 text-xs text-slate-400">Searching...</p> : null}
+            {!searchLoading && searchQuery.trim().length >= 2 && searchResults.length === 0 ? (
+              <p className="px-2 py-1 text-xs text-slate-400">Nothing found</p>
+            ) : null}
+            <div className="tg-scrollbar max-h-[50vh] space-y-1 overflow-auto">
+              {searchResults.map((message) => (
+                <button
+                  className="block w-full rounded-lg bg-slate-800/80 px-3 py-2 text-left hover:bg-slate-700/80"
+                  key={`search-msg-${message.id}`}
+                  onClick={() => {
+                    setActiveChatId(message.chat_id);
+                    setSearchOpen(false);
+                  }}
+                >
+                  <p className="mb-1 text-[11px] text-slate-400">chat #{message.chat_id} · msg #{message.id}</p>
+                  <p className="line-clamp-2 text-sm text-slate-100">{message.text || "[media]"}</p>
+                </button>
+              ))}
+            </div>
+          </div>
+        </div>
+      ) : null}
     </main>
   );
 }