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/app/client/client-view.tsx

@@ -220,11 +220,13 @@ export function ClientView({
 			window.removeEventListener("touchmove", onTouchMove);
 			window.removeEventListener("touchend", onEnd);
 		};
-	}, [dragging]);
+	// biome-ignore lint/correctness/useExhaustiveDependencies: snapPos is a useCallback used intentionally here
+	}, [dragging, snapPos]);
 
 	return (
 		<>
 			{pos ? (
+				// biome-ignore lint/a11y/noStaticElementInteractions: draggable toolbar with explicit mouse/touch handlers
 				<div
 					ref={toolbarRef}
 					className={`fixed z-[9999] backdrop-blur-xl bg-black/30 rounded-xl border border-white/10 shadow-2xl px-1.5 py-1 select-none ${dragging ? "cursor-grabbing" : "cursor-grab"}`}