fix(deps): update nextjs monorepo to v16

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-node](https://github.com/actions/setup-node) | action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/setup-node (actions/setup-node)</summary>

### [`v6`](https://github.com/actions/setup-node/compare/v5...v6)

[Compare Source](https://github.com/actions/setup-node/compare/v5...v6)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xMjIuMyIsInVwZGF0ZWRJblZlciI6IjQxLjEyMi4zIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbXX0=-->

Reviewed-on: #15
Co-authored-by: Renovate Bot <renovatebot@schulze.network>
Co-committed-by: Renovate Bot <renovatebot@schulze.network>

.gitea/workflows/lint.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with:
-          node-version: 22
+          node-version: 24
           cache: "pnpm"
 
       - name: Install dependencies

event-dates.json

@@ -1,7 +1,8 @@
 {
-  "eventDates": ["2025-09-05", "1999-01-01"],
+  "eventDates": ["2025-09-05", "2025-10-25", "2025-12-06", "1999-01-01"],
   "cutoffTime": "23:00",
+  "blockDurationHours": 6,
   "message": "Sign-ups are closed for today's event. Please come back tomorrow.",
 
-  "internalComment": "Add event dates in YYYY-MM-DD format. Signups will be disabled after 11pm (23:00) on these dates by default."
+  "internalComment": "Add event dates in YYYY-MM-DD format. Signups will be disabled after cutoffTime (23:00) for blockDurationHours (6 hours)."
 }

lib/signup-time-check.test.ts

@@ -0,0 +1,40 @@
+import { isSignupBlocked } from "./signup-time-check";
+
+// Test helper to check different scenarios
+function testScenario(description: string, date: Date, expected: boolean) {
+  const result = isSignupBlocked(date);
+  const status = result.blocked === expected ? "✅ PASS" : "❌ FAIL";
+  console.log(`${status} ${description}`);
+  console.log(`  Expected blocked: ${expected}, Got: ${result.blocked}`);
+  if (result.message) {
+    console.log(`  Message: ${result.message}`);
+  }
+  console.log();
+}
+
+// Run tests
+console.log("Testing signup blocking logic...\n");
+
+// October 25, 2025 at 22:00 (before cutoff)
+testScenario("Oct 25 at 22:00 - Before cutoff", new Date("2025-10-25T22:00:00"), false);
+
+// October 25, 2025 at 23:00 (exactly at cutoff)
+testScenario("Oct 25 at 23:00 - At cutoff time", new Date("2025-10-25T23:00:00"), true);
+
+// October 25, 2025 at 23:30 (during block period)
+testScenario("Oct 25 at 23:30 - During block period", new Date("2025-10-25T23:30:00"), true);
+
+// October 26, 2025 at 02:00 (3 hours into block)
+testScenario("Oct 26 at 02:00 - 3 hours into block", new Date("2025-10-26T02:00:00"), true);
+
+// October 26, 2025 at 04:59 (just before block ends)
+testScenario("Oct 26 at 04:59:59 - Just before block ends", new Date("2025-10-26T04:59:59"), true);
+
+// October 26, 2025 at 05:00 (block period over)
+testScenario("Oct 26 at 05:00 - Block period ended", new Date("2025-10-26T05:00:00"), false);
+
+// October 26, 2025 at 12:00 (well after block)
+testScenario("Oct 26 at 12:00 - Well after block", new Date("2025-10-26T12:00:00"), false);
+
+// Random non-event date
+testScenario("Oct 20 at 23:00 - Non-event date", new Date("2025-10-20T23:00:00"), false);

lib/signup-time-check.ts

@@ -1,17 +1,23 @@
 import eventConfig from "@/event-dates.json";
 
-export function isSignupBlocked(): { blocked: boolean; message?: string } {
-  const now = new Date();
-  const currentDate = now.toISOString().split("T")[0]; // YYYY-MM-DD format
-  const currentTime = now.toTimeString().slice(0, 5); // HH:MM format
+export function isSignupBlocked(currentTime?: Date): { blocked: boolean; message?: string } {
+  const now = currentTime || new Date();
+  const cutoffTime = eventConfig.cutoffTime || "15:00";
+  const blockDurationHours = eventConfig.blockDurationHours || 6;
 
-  // Check if today is an event date
-  const isEventDay = eventConfig.eventDates.includes(currentDate);
+  // Check each event date to see if we're in a block period
+  for (const eventDate of eventConfig.eventDates) {
+    // Parse the event date and cutoff time in local timezone
+    const [year, month, day] = eventDate.split("-").map(Number);
+    const [hours, minutes] = cutoffTime.split(":").map(Number);
+    const blockStart = new Date(year, month - 1, day, hours, minutes, 0, 0);
 
-  if (isEventDay) {
-    // Check if current time is after the cutoff time (default 15:00 / 3pm)
-    const cutoffTime = eventConfig.cutoffTime || "15:00";
-    if (currentTime >= cutoffTime) {
+    // Calculate when the block period ends (using wall-clock hours to handle DST correctly)
+    const blockEnd = new Date(blockStart);
+    blockEnd.setHours(blockStart.getHours() + blockDurationHours);
+
+    // Check if current time is within the block period
+    if (now >= blockStart && now < blockEnd) {
       return {
         blocked: true,
         message: eventConfig.message,

package.json

@@ -18,8 +18,8 @@
     "clsx": "^2.1.1",
     "cssnano": "^7.1.0",
     "date-fns": "^4.1.0",
-    "lucide-react": "^0.545.0",
-    "next": "^15.4.1",
+    "lucide-react": "^0.552.0",
+    "next": "^16.0.0",
     "next-plausible": "^3.12.4",
     "postcss-flexbugs-fixes": "^5.0.2",
     "postcss-preset-env": "^10.2.4",
@@ -32,17 +32,17 @@
     "zod": "^4.0.5"
   },
   "devDependencies": {
-    "@tailwindcss/postcss": "4.1.14",
-    "@types/node": "22.18.10",
+    "@tailwindcss/postcss": "4.1.16",
+    "@types/node": "24.9.2",
     "@types/react": "19.2.2",
-    "@types/react-dom": "19.2.1",
-    "eslint": "9.37.0",
-    "eslint-config-next": "15.5.4",
+    "@types/react-dom": "19.2.2",
+    "eslint": "9.39.0",
+    "eslint-config-next": "16.0.1",
     "eslint-config-prettier": "10.1.8",
     "postcss": "8.5.6",
-    "tailwindcss": "4.1.14",
-    "turbo": "2.5.8",
+    "tailwindcss": "4.1.16",
+    "turbo": "2.6.0",
     "typescript": "5.9.3"
   },
-  "packageManager": "pnpm@10.18.2"
+  "packageManager": "pnpm@10.20.0"
 }