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/auth/register-form.tsx

@@ -291,62 +291,28 @@ export function RegisterForm({
 					}}
 				>
 					<div className="flex items-center gap-3 text-sm">
-						<button
-							type="button"
-							role="checkbox"
-							aria-checked={termsAccepted}
-							onClick={() => setTermsAccepted(!termsAccepted)}
-							className="w-5 h-5 rounded border-2 flex items-center justify-center shrink-0 transition-all duration-200"
-							style={{
-								borderColor: termsAccepted
-									? "var(--color-primary)"
-									: "color-mix(in srgb, var(--color-text-muted) 30%, transparent)",
-								backgroundColor: termsAccepted
-									? "var(--color-primary)"
-									: "transparent",
-							}}
-						>
-							{termsAccepted && (
-								<svg
-									className="w-3 h-3"
-									style={{ color: "var(--color-primary-foreground)" }}
-									fill="none"
-									stroke="currentColor"
-									viewBox="0 0 24 24"
-									role="img"
-									aria-label="Terms accepted"
-								>
-									<title>Terms accepted</title>
-									<path
-										strokeLinecap="round"
-										strokeLinejoin="round"
-										strokeWidth={3}
-										d="M5 13l4 4L19 7"
-									/>
-								</svg>
-							)}
-						</button>
 						<input
-							type="hidden"
+							type="checkbox"
+							id="terms"
 							name="terms"
-							value={termsAccepted ? "1" : ""}
+							checked={termsAccepted}
+							onChange={(e) => setTermsAccepted(e.target.checked)}
+							className="w-5 h-5 rounded border-2 accent-(--color-primary) shrink-0 cursor-pointer"
 						/>
-						<span
-							role="checkbox"
-							aria-checked={termsAccepted}
-							tabIndex={0}
+						<label
+							htmlFor="terms"
+							className="font-semibold cursor-pointer select-none"
+							style={{ color: "var(--color-text-readable)" }}
+							onClick={() => setTermsAccepted(!termsAccepted)}
 							onKeyDown={(e) => {
 								if (e.key === "Enter" || e.key === " ") {
 									e.preventDefault();
 									setTermsAccepted(!termsAccepted);
 								}
 							}}
-							className="font-semibold cursor-pointer select-none"
-							style={{ color: "var(--color-text-readable)" }}
-							onClick={() => setTermsAccepted(!termsAccepted)}
 						>
 							{t("termsAccept", { hotel: hotelName })}
-						</span>
+						</label>
 					</div>
 				</div>
 
@@ -372,11 +338,13 @@ export function RegisterForm({
 				>
 					{isPending ? (
 						<span className="inline-flex items-center justify-center gap-2">
-							<svg
-								className="animate-spin h-4 w-4"
-								viewBox="0 0 24 24"
-								fill="none"
-							>
+						<svg
+							className="animate-spin h-4 w-4"
+							viewBox="0 0 24 24"
+							fill="none"
+							role="img"
+							aria-label="Loading"
+						>
 								<circle
 									className="opacity-25"
 									cx="12"