feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

internal/app/resolvespec_admin_test.go

@@ -61,6 +61,7 @@ func TestResolveSpecGuardAllowsSupportedMutations(t *testing.T) {
 		entity    string
 		operation string
 	}{
+		{name: "learnings read", entity: "learnings", operation: "read"},
 		{name: "projects create", entity: "projects", operation: "create"},
 		{name: "thoughts update", entity: "thoughts", operation: "update"},
 		{name: "thoughts delete", entity: "thoughts", operation: "delete"},
@@ -119,6 +120,13 @@ func TestResolveSpecGuardBlocksUnsupportedMutations(t *testing.T) {
 			wantCode:      http.StatusForbidden,
 			wantMessageIn: `operation "delete" is not allowed for public.stored_files`,
 		},
+		{
+			name:          "mutations blocked for learnings",
+			entity:        "learnings",
+			operation:     "delete",
+			wantCode:      http.StatusForbidden,
+			wantMessageIn: `operation "delete" is not allowed for public.learnings`,
+		},
 		{
 			name:          "unknown operation is rejected",
 			entity:        "projects",
@@ -152,3 +160,13 @@ func TestResolveSpecGuardBlocksUnsupportedMutations(t *testing.T) {
 		})
 	}
 }
+
+func TestResolveSpecModelsIncludeLearnings(t *testing.T) {
+	models := resolveSpecModels()
+	for _, model := range models {
+		if model.schema == "public" && model.entity == "learnings" {
+			return
+		}
+	}
+	t.Fatal("resolveSpecModels() missing public.learnings")
+}