feat(updater): wire tauri-plugin-updater with GitHub releases endpoint + update toast

src-tauri/src/commands/update.rs

@@ -0,0 +1,38 @@
+use tauri::AppHandle;
+use tauri_plugin_updater::UpdaterExt;
+
+/// Check for an available update. Returns Some(version_string) if one is
+/// available, None if already up to date, and Err if the check fails.
+#[tauri::command]
+pub async fn check_for_update(app: AppHandle) -> Result<Option<String>, String> {
+    let update = app
+        .updater()
+        .map_err(|e| format!("Updater not available: {e}"))?
+        .check()
+        .await
+        .map_err(|e| format!("Update check failed: {e}"))?;
+
+    match update {
+        Some(u) => Ok(Some(u.version.to_string())),
+        None => Ok(None),
+    }
+}
+
+/// Download and stage the update. The app will install it on next launch.
+#[tauri::command]
+pub async fn install_update(app: AppHandle) -> Result<(), String> {
+    let update = app
+        .updater()
+        .map_err(|e| format!("Updater not available: {e}"))?
+        .check()
+        .await
+        .map_err(|e| format!("Update check failed: {e}"))?
+        .ok_or_else(|| "No update available".to_string())?;
+
+    update
+        .download_and_install(|_, _| {}, || {})
+        .await
+        .map_err(|e| format!("Install failed: {e}"))?;
+
+    Ok(())
+}