feat: Enhance Game component with extra puzzles feature

- Introduce requiredDailyKeys to track daily puzzle completion across genres.
- Implement logic to show an ExtraPuzzlesPopover when all daily puzzles are completed.
- Add localized messages for extra puzzles in both English and German.
- Update GenrePage and Home components to pass requiredDailyKeys to the Game component.

lib/externalPuzzles.ts

@@ -0,0 +1,47 @@
+export type ExternalPuzzle = {
+    id: string;
+    nameDe: string;
+    nameEn: string;
+    url: string;
+    isActive?: boolean;
+};
+
+/**
+ * Zentrale Liste externer Rätselangebote.
+ * 
+ * Erweiterung: Einfach neuen Eintrag in dieses Array hinzufügen.
+ */
+export const externalPuzzles: ExternalPuzzle[] = [
+    {
+        id: 'pastpuzzle',
+        nameDe: 'Past Puzzle',
+        nameEn: 'Past Puzzle',
+        url: 'https://www.pastpuzzle.de/#/',
+        isActive: true,
+    },
+    {
+        id: 'woerdle',
+        nameDe: 'Wördle',
+        nameEn: 'Wördle',
+        url: 'https://www.wördle.de',
+        isActive: true,
+    },
+    {
+        id: 'ciddle',
+        nameDe: 'Ciddle',
+        nameEn: 'Ciddle',
+        url: 'https://ciddle.winklerweb.net',
+        isActive: true,
+    },
+];
+
+export function getRandomExternalPuzzle(): ExternalPuzzle | null {
+    const activePuzzles = externalPuzzles.filter(p => p.isActive !== false);
+    if (activePuzzles.length === 0) {
+        return null;
+    }
+    const index = Math.floor(Math.random() * activePuzzles.length);
+    return activePuzzles[index] ?? null;
+}
+
+

lib/extraPuzzlesTracker.ts

@@ -0,0 +1,68 @@
+import { getTodayISOString } from './dateUtils';
+
+const DAILY_PLAYED_PREFIX = 'hoerdle_daily_played_';
+const EXTRA_POPOVER_PREFIX = 'hoerdle_extra_puzzles_shown_';
+
+function getTodayKey(prefix: string): string | null {
+    if (typeof window === 'undefined') return null;
+    const today = getTodayISOString();
+    return `${prefix}${today}`;
+}
+
+export function markDailyPuzzlePlayedToday(genreKey: string) {
+    const storageKey = getTodayKey(DAILY_PLAYED_PREFIX);
+    if (!storageKey) return;
+
+    try {
+        const raw = window.localStorage.getItem(storageKey);
+        const list: string[] = raw ? JSON.parse(raw) : [];
+        if (!list.includes(genreKey)) {
+            list.push(genreKey);
+            window.localStorage.setItem(storageKey, JSON.stringify(list));
+        }
+    } catch (e) {
+        console.warn('[extraPuzzles] Failed to mark daily puzzle as played', e);
+    }
+}
+
+export function hasPlayedAllDailyPuzzlesForToday(requiredGenreKeys: string[]): boolean {
+    const storageKey = getTodayKey(DAILY_PLAYED_PREFIX);
+    if (!storageKey) return false;
+
+    try {
+        const raw = window.localStorage.getItem(storageKey);
+        const played: string[] = raw ? JSON.parse(raw) : [];
+        if (!Array.isArray(played) || played.length === 0) {
+            return false;
+        }
+        return requiredGenreKeys.every(key => played.includes(key));
+    } catch (e) {
+        console.warn('[extraPuzzles] Failed to read played puzzles', e);
+        return false;
+    }
+}
+
+export function hasSeenExtraPuzzlesPopoverToday(): boolean {
+    const storageKey = getTodayKey(EXTRA_POPOVER_PREFIX);
+    if (!storageKey) return false;
+
+    try {
+        return window.localStorage.getItem(storageKey) === 'true';
+    } catch (e) {
+        console.warn('[extraPuzzles] Failed to read popover state', e);
+        return false;
+    }
+}
+
+export function markExtraPuzzlesPopoverShownToday() {
+    const storageKey = getTodayKey(EXTRA_POPOVER_PREFIX);
+    if (!storageKey) return;
+
+    try {
+        window.localStorage.setItem(storageKey, 'true');
+    } catch (e) {
+        console.warn('[extraPuzzles] Failed to persist popover state', e);
+    }
+}
+
+