huge documentaton restructure for docusaurus

docs/help/en/guest/offline-sync.md

@@ -0,0 +1,40 @@
+---
+title: "Offline Mode & Sync"
+locale: en
+slug: offline-sync
+audience: guest
+summary: "Participate without coverage, queue uploads safely, and know when everything is delivered."
+version_introduced: 2025.4
+requires_app_version: "^3.2.0"
+status: draft
+translation_state: aligned
+last_reviewed_at: 2025-02-22
+owner: reliability@fotospiel.app
+related:
+  - slug: uploading-photos
+  - slug: privacy-and-support
+---
+
+## When to read this
+You expect intermittent connectivity (mountains, cellars, roaming). The guest app is built to keep working offline as long as the initial sync completed.
+
+## What stays available offline
+- Event feed (latest 250 photos) and album structure.
+- Upload rules (size limits, moderation settings).
+- Draft achievements and stickers.
+- Help center excerpt (top 10 articles per locale) if you opened Help at least once online.
+
+## Offline workflow
+1. **Capture as usual.** Everything stores in the encrypted local queue.
+2. **Review pending uploads.** Look for the grey *Queued* label. Add tags/notes even while offline.
+3. **Monitor storage.** The banner warns if device storage drops below 500 MB; delete sent items or transfer to another device.
+4. **Reconnect briefly.** Once any network is available, open Fotospiel. Sync restarts automatically, prioritizing oldest items.
+5. **Confirm completion.** A green toast “All uploads delivered” appears and the queue counter returns to zero.
+
+## Troubleshooting
+- **Stuck in “Queued” despite coverage?** Toggle airplane mode off/on, then reopen the app to reset the service worker.
+- **Different devices?** Offline queues stay on the original device; there’s no cross-device merge.
+- **Battery saver** might pause background sync. Keep the app in the foreground for large batches.
+
+### Need more help?
+Use Settings → Help → *Send diagnostics* once you are online; support receives anonymized logs plus your event ID.