fix(windows): reopen every project window on startup (#1574)

"Reopen projects on startup" only saved window groups, so windows opened with New Window were lost. The saved session now lists every open project window (groups with their tabs and selection, single windows on their own), and the previous run's session is read before this run first overwrites it, so the startup project can't replace it before the other windows are restored.

src-tauri/src/commands/app.rs

@@ -85,10 +85,8 @@ pub async fn open_project(window: Window, path: PathBuf) -> IdeResult<ProjectInf
     let info = project_info(&project);
     let _ = window.set_title(&info.name);
     window.state::<AppState>().sink.emit(ide_core::IdeEvent::WindowGroupsChanged);
-    let grouped = window.state::<crate::windows::WindowsState>().groups.lock().group(window.label()).is_some();
-    if grouped {
-        crate::window_groups::persist(window.app_handle()).await?;
-    }
+    // Every project window is part of the session reopened at the next start.
+    crate::window_groups::persist(window.app_handle()).await?;
     Ok(info)
 }