feat: extend PWA offline support to all recipe routes and glaube pages

- Add offline support for category, tag, icon list pages
- Add offline support for favorites page (stores locally for offline)
- Add offline support for season list page
- Cache root page and glaube pages for offline access
- Dynamically discover glaube routes at build time using Vite glob
- Add db functions for getAllCategories, getAllTags, getAllIcons
- Pre-cache __data.json for all category, tag, icon, season subroutes
- Update service worker to cache glaube and root page responses

src/routes/[recipeLang=recipeLang]/season/+page.ts

@@ -0,0 +1,41 @@
+import { browser } from '$app/environment';
+import { isOffline, canUseOfflineData } from '$lib/offline/helpers';
+import { getBriefRecipesBySeason, isOfflineDataAvailable } from '$lib/offline/db';
+import { rand_array } from '$lib/js/randomize';
+
+export async function load({ data }) {
+    // On the server, just pass through the server data unchanged
+    if (!browser) {
+        return {
+            ...data,
+            isOffline: false
+        };
+    }
+
+    // On the client, check if we need to load from IndexedDB
+    const shouldUseOfflineData = (isOffline() || data?.isOffline || !data?.season?.length) && canUseOfflineData();
+
+    if (shouldUseOfflineData) {
+        try {
+            const hasOfflineData = await isOfflineDataAvailable();
+            if (hasOfflineData) {
+                const currentMonth = new Date().getMonth() + 1;
+                const recipes = await getBriefRecipesBySeason(currentMonth);
+
+                return {
+                    ...data,
+                    season: rand_array(recipes),
+                    isOffline: true
+                };
+            }
+        } catch (error) {
+            console.error('Failed to load offline season data:', error);
+        }
+    }
+
+    // Return server data as-is
+    return {
+        ...data,
+        isOffline: false
+    };
+}