refactor(calendar): split import_pst into a reusable core fn

import_pst_core takes &AppHandle/&dyn Store directly instead of the
State<AppState> extractor, so the startup auto-sync pass (lib.rs) can
run the same import logic without going through a Tauri command.

src-tauri/src/commands.rs

@@ -60,6 +60,8 @@ fn default_settings() -> Settings {
         sync_enabled: false,
         retention_max_age_days: None,
         retention_max_size_gb: None,
+        pst_last_path: None,
+        pst_auto_sync: false,
     }
 }
 
@@ -1947,10 +1949,12 @@ pub async fn confirm_action_items(
 /// progress, so `pst://progress` is a start/done signal rather than
 /// per-item — real per-item progress would mean reimplementing readpst's
 /// internals, not worth it for a one-shot import.
-#[tauri::command]
-pub async fn import_pst(
-    app: AppHandle,
-    state: State<'_, AppState>,
+///
+/// Split from the `#[tauri::command]` wrapper so the startup auto-sync pass
+/// (T6.2, `pst_auto_sync`) can call the same logic without a `State` extractor.
+pub(crate) async fn import_pst_core(
+    app: &AppHandle,
+    store: &dyn crate::storage::Store,
     path: String,
     password: Option<String>,
 ) -> WaResult<u32> {
@@ -1967,8 +1971,7 @@ pub async fn import_pst(
         serde_json::json!({ "processed": 0, "total": total }),
     );
 
-    let imported = state
-        .store
+    let imported = store
         .import_calendar_events(events)
         .await
         .map_err(|e| WaError::new("storage", e.to_string()))?;
@@ -1980,6 +1983,16 @@ pub async fn import_pst(
     Ok(imported)
 }
 
+#[tauri::command]
+pub async fn import_pst(
+    app: AppHandle,
+    state: State<'_, AppState>,
+    path: String,
+    password: Option<String>,
+) -> WaResult<u32> {
+    import_pst_core(&app, state.store.as_ref(), path, password).await
+}
+
 /// Browse imported calendar events (T6.3, FR-CAL-2).
 #[tauri::command]
 pub async fn list_calendar_events(