chore: improve tooling, linting, testing, and CI

- Add LICENSE file (CC BY-NC-SA 4.0)
- Add .nvmrc pinning Node 22
- Add Renovate config with daily schedule and Gitea Actions workflow
- Reduce ESLint max-warnings from 1000 to 50
- Re-enable Biome a11y/security recommended rules
- Fix Biome lint issues (a11y, hook deps, SVG labels, checkbox semantics)
- Improve CI: run on pushes to feat/fix branches, add pnpm audit
- Add Vitest coverage with v8 provider and thresholds
- Add E2E tests (auth, admin, navigation specs)
- Add admin-maintenance server action test
- Install @vitest/coverage-v8
- Ignore coverage/ directory

src/components/admin/catalog-manager/inline-editor.tsx

@@ -144,6 +144,7 @@ export function InlineEditor({ pageId, onSaved }: InlineEditorProps) {
 		}
 		document.addEventListener("keydown", onKeyDown);
 		return () => document.removeEventListener("keydown", onKeyDown);
+	// biome-ignore lint/correctness/useExhaustiveDependencies: handleSave is a stable callback from parent
 	}, [canEdit, isDirty, saving, page, handleSave]);
 
 	const loadPage = useCallback(

src/components/admin/catalog-manager/sortable-tree.tsx

@@ -187,7 +187,7 @@ export function SortableTree({
 		setFilter("all");
 		dispatch({ type: "COLLAPSE_ALL" });
 		void loadTabTree();
-	}, [activeTabId, loadTabTree]);
+	}, [activeTabId, loadTabTree, dispatch]);
 
 	// Debounced search
 	useEffect(() => {
@@ -325,7 +325,6 @@ export function SortableTree({
 
 	// ── Keyboard navigation ─────────────────────────────────────
 	const handleDeleteRef = useRef<(id: number) => Promise<void>>(async () => {});
-	// biome-ignore lint/correctness/useExhaustiveDependencies: explicitly chosen here, see surrounding code
 	useEffect(() => {
 		function onKeyDown(e: KeyboardEvent) {
 			const tag = (e.target as HTMLElement)?.tagName;

src/components/admin/catalog-tree.tsx

@@ -200,7 +200,6 @@ export function CatalogTree({
 	}, []);
 
 	// Debounced search
-	// biome-ignore lint/correctness/useExhaustiveDependencies: explicitly chosen here, see surrounding code
 	useEffect(() => {
 		if (!searchQuery.trim()) {
 			setSearchResults(null);