feat(ui): persist window state and clarify transfer telemetry

- Persist bounded logical main-window geometry with work-area-safe startup restoration.
- Persist the Folders collapse preference in SQLite with guarded legacy localStorage migration.
- Keep media transfer telemetry truthful and compact the transfer controls across locales.
- Add bridge, presentation, persistence, geometry, and configuration regression coverage.

src-tauri/tauri.linux.conf.json

@@ -5,7 +5,7 @@
         "create": false,
         "title": "Firelink",
         "width": 1280,
-        "height": 760,
+        "height": 800,
         "minWidth": 960,
         "minHeight": 640,
         "transparent": false,