Add rustfmt.toml (same as core and server) and apply cargo fmt

Formatting only. CI now runs cargo fmt --check here as in the other Rust repos.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src-tauri/src/main.rs

@@ -223,7 +223,15 @@ fn list_items(app: State<'_, App>) -> CmdResult<Vec<Summary>> {
 #[tauri::command]
 fn get_item(app: State<'_, App>, id: String) -> CmdResult<Detail> {
     let d = app.core.get_item(id).map_err(err)?;
-    Ok(Detail { id: d.id, title: d.title, username: d.username, password: d.password, urls: d.urls, totp: d.totp, notes: d.notes })
+    Ok(Detail {
+        id: d.id,
+        title: d.title,
+        username: d.username,
+        password: d.password,
+        urls: d.urls,
+        totp: d.totp,
+        notes: d.notes,
+    })
 }
 
 #[tauri::command]
@@ -282,10 +290,7 @@ fn copy_secret(app: State<'_, App>, id: String, field: Option<String>) -> CmdRes
         cb.set().exclude_from_monitoring().exclude_from_cloud().exclude_from_history().text(secret.to_string())
     }
     #[cfg(not(windows))]
-    {
-        cb.set_text(secret.to_string())
-    }
-    .map_err(|e| e.to_string())?;
+    { cb.set_text(secret.to_string()) }.map_err(|e| e.to_string())?;
     drop(guard);
     thread::spawn(move || {
         thread::sleep(CLIPBOARD_CLEAR);