feat: add text search to All Tasks page

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

routers/tasks.py

@@ -33,6 +33,7 @@ async def list_tasks(
     status: Optional[str] = None,
     priority: Optional[str] = None,
     context: Optional[str] = None,
+    search: Optional[str] = None,
     sort: str = "sort_order",
     db: AsyncSession = Depends(get_db),
 ):
@@ -40,6 +41,9 @@ async def list_tasks(
 
     where_clauses = ["t.is_deleted = false"]
     params = {}
+    if search:
+        where_clauses.append("t.title ILIKE :search")
+        params["search"] = f"%{search}%"
     if domain_id:
         where_clauses.append("t.domain_id = :domain_id")
         params["domain_id"] = domain_id
@@ -97,6 +101,7 @@ async def list_tasks(
     return templates.TemplateResponse("tasks.html", {
         "request": request, "sidebar": sidebar, "items": items,
         "domains": domains, "projects": projects, "context_types": context_types,
+        "current_search": search or "",
         "current_domain_id": domain_id or "",
         "current_project_id": project_id or "",
         "current_status": status or "",