feat(launcher): implement force-sync and chronological download priority

Onsite operators can now manually trigger a full pre-sync of all location
materials via a "Force Sync Location" button in the Launcher config.
This ensures podium Macs have all content cached before an event starts.

- Added trigger__force_location_sync to launcher session store.
- Implemented force_location_sync() in background sync engine to perform
  recursive metadata fetches for all sessions in a location.
- Optimized download queue with a 4-tier chronological sort:
  1. Event/Location assets (Global)
  2. Sessions by start time (Earliest first)
  3. Presentations by start time (Sequential order)
  4. File creation date (First-in fairness for on-time uploads)
- Updated module and native integration documentation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

documentation/PROJECT__AE_Events_Launcher_Native_integration.md

@@ -72,10 +72,15 @@ Files are stored persistently using their SHA-256 hash to prevent filename colli
 - **Filename:** `{hash}.file`
 
 ### 4.2 Background Sync (File Warming)
-When a user navigates to a session in the Launcher UI, the `LauncherBackgroundSync` component:
-1.  Extracts all `event_file_id` values for that session.
-2.  Checks the native cache via `aetherNative.check_cache`.
-3.  Triggers background downloads for missing files via `aetherNative.download_to_cache`.
+When a user navigates to a session in the Launcher UI, the `LauncherBackgroundSync` component warms the cache for that specific session. To ensure full room readiness, a **Force Sync Location** trigger is available in the configuration UI.
+
+1.  **Metadata Fetch:** The system fetches all sessions, presentations, and presenters for the current location into the local database (Dexie).
+2.  **Chronological Priority:** Missing files are added to the download queue and sorted to prioritize the event schedule:
+    -   **Tier 1: Global Assets** — Event and Location level files (virtual time 0).
+    -   **Tier 2: Session Schedule** — Earliest sessions are prioritized first.
+    -   **Tier 3: Presentation Order** — Within a session, speakers are prioritized by their start time.
+    -   **Tier 4: Integrity & Fairness** — Tie-breakers use `created_on` (oldest first) to ensure on-time uploads are cached before last-minute revisions.
+3.  **Download:** Triggers background downloads via `aetherNative.download_to_cache` sequentially to preserve network bandwidth and ensure file integrity.
 
 ### 4.3 Safe Handover (Launch Sequence)
 When a user clicks "Open", the system follows a non-destructive sequence: