feat(import-progress): track and expose Immich import progress

This change introduces a cross-language import progress API for Immich
imports and exposes a new query command to report live progress. A
new ImportProgress model captures active state, totals, and bytes
downloaded, allowing consuming code to display import status to users.

- Adds ImportProgress data type and progress tracking during import
- Exposes get_immich_import_progress command in Android and Rust
- Updates permissions and schemas to include allow-get-immich-import-progress

plugins/src/commands.rs

@@ -111,3 +111,8 @@ pub(crate) async fn import_immich_assets<R: Runtime>(
 ) -> Result<WallpaperState> {
     app.wallpaper().import_immich_assets(ImmichImportRequest { ids })
 }
+
+#[command]
+pub(crate) async fn get_immich_import_progress<R: Runtime>(app: AppHandle<R>) -> Result<ImmichImportProgress> {
+    app.wallpaper().get_immich_import_progress()
+}