fix(startup): gate renderer IPC on document load (#37)

- Issue #37: Windows 1.4.0 exited with STATUS_STACK_OVERFLOW before showing the main window.
- Gate lazy entrypoint imports, Zustand persistence, logger initialization, and console forwarding until WebView2 document load.
- Preserve the native Ready reveal and pending-window restore lifecycle across platforms.
- Show a closeable startup error if the main entrypoint cannot load.

Fixes #37.

src-tauri/src/lib.rs

@@ -19903,7 +19903,6 @@ pub fn run() {
                 mark_main_window_startup_complete(app_handle);
                 #[cfg(target_os = "windows")]
                 reveal_main_window(app_handle);
-                #[cfg(not(target_os = "windows"))]
                 restore_pending_main_window(app_handle);
             }
             #[cfg(target_os = "macos")]