feat: add search APIs and telegram-like chats sidebar flow

- implement chat query filtering and message search endpoints

- add db indexes for search fields

- activate chats search input in web

- replace inline create panel with floating TG-style action menu

app/chats/repository.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Select, func, select
+from sqlalchemy import Select, String, func, or_, select
 from sqlalchemy.orm import aliased
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -28,20 +28,31 @@ async def count_chat_members(db: AsyncSession, *, chat_id: int) -> int:
     return int(result.scalar_one())
 
 
-def _user_chats_query(user_id: int) -> Select[tuple[Chat]]:
-    return (
-        select(Chat)
-        .join(ChatMember, ChatMember.chat_id == Chat.id)
-        .where(ChatMember.user_id == user_id)
-        .order_by(Chat.id.desc())
-    )
+def _user_chats_query(user_id: int, query: str | None = None) -> Select[tuple[Chat]]:
+    stmt = select(Chat).join(ChatMember, ChatMember.chat_id == Chat.id).where(ChatMember.user_id == user_id)
+    if query and query.strip():
+        q = f"%{query.strip()}%"
+        stmt = stmt.where(
+            or_(
+                Chat.title.ilike(q),
+                Chat.type.cast(String).ilike(q),
+            )
+        )
+    return stmt.order_by(Chat.id.desc())
 
 
-async def list_user_chats(db: AsyncSession, *, user_id: int, limit: int = 50, before_id: int | None = None) -> list[Chat]:
-    query = _user_chats_query(user_id).limit(limit)
+async def list_user_chats(
+    db: AsyncSession,
+    *,
+    user_id: int,
+    limit: int = 50,
+    before_id: int | None = None,
+    query: str | None = None,
+) -> list[Chat]:
+    query_stmt = _user_chats_query(user_id, query=query).limit(limit)
     if before_id is not None:
-        query = query.where(Chat.id < before_id)
-    result = await db.execute(query)
+        query_stmt = query_stmt.where(Chat.id < before_id)
+    result = await db.execute(query_stmt)
     return list(result.scalars().all())