fix(macos): restore the hidden window on Dock-icon click (#248)

[aniketshukla1]

Summary

Closes #248.

After the window is dismissed, clicking the Dock icon activates OpenWorker (the menu bar switches) but no window appears, and open -a OpenWorker doesn't bring it back — only open -n (a brand-new instance) does.

Cause

Close-to-tray hides the main window rather than quitting:

win.on_window_event(move |event| {
    if let WindowEvent::CloseRequested { api, .. } = event {
        let _ = w.hide();
        api.prevent_close();
    }
});

But the top-level RunEvent handler only dealt with ExitRequested/Exit. On macOS a Dock-icon click fires RunEvent::Reopen (the applicationShouldHandleReopen delegate callback), and Tauri does nothing with it by default — so a hidden window is never reshown.

Fix

Handle RunEvent::Reopen by reshowing the main window through the existing show_main helper — the exact path the tray Open item already uses:

.run(|app, event| {
    #[cfg(target_os = "macos")]
    {
        if let RunEvent::Reopen { .. } = &event {
            show_main(app);   // unminimize + show + set_focus
        }
    }
    // ...existing Exit handling...
});

Reopen is macOS-only, so the arm is #[cfg(target_os = "macos")]. The { .. } pattern intentionally ignores the has_visible_windows field: reshowing/focusing on any reopen is the desired behavior and is a harmless no-op when a window is already up.

Verification

I confirmed the API against the pinned tauri 2.11.5 source in the cargo cache:

// tauri-2.11.5/src/app.rs
#[non_exhaustive]
#[cfg(target_os = "macos")]
Reopen {
    /// Indicates whether the NSApplication object found any visible windows in your application.
    has_visible_windows: bool,
}

So the variant is macOS-gated (the #[cfg] wrapper is required), it's a non-exhaustive struct variant (the { .. } pattern is correct), and it's emitted exactly for the Dock-icon reopen this issue is about. show_main(&AppHandle) is already called identically by the tray menu handler.

I did not run a full cargo build locally: generate_context!() embeds frontendDist (../dist), so compiling requires a complete npm run build + Tauri toolchain pass. The change is a 3-line addition that reuses an existing helper and mirrors the existing RunEvent matching in the same closure; happy to adjust if CI surfaces anything.