Windows stability improvements (#207)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Haze <hazeone@users.noreply.github.com>

electron/main/app-state.ts

@@ -1,5 +1,18 @@
-export let isQuitting = false;
+/**
+ * Application quit state.
+ *
+ * Exposed as a function accessor (not a bare `export let`) so that every
+ * import site reads the *live* value.  With `export let`, bundlers that
+ * compile to CJS may snapshot the variable at import time, causing
+ * `isQuitting` to stay `false` forever and preventing the window from
+ * closing on Windows/Linux.
+ */
+let _isQuitting = false;
+
+export function isQuitting(): boolean {
+  return _isQuitting;
+}
 
 export function setQuitting(value = true): void {
-  isQuitting = value;
+  _isQuitting = value;
 }