feat: improve app visibility settings and keyboard shortcuts

- Add ESC key navigation: return to previous view from full-screen panels
- Sync tray menu with app visibility settings (hide disabled apps)
- Add fnm (fast node manager) path support for CLI version scanning
- Fix useModelState being overwritten when user is editing model fields
- Fix EditProviderDialog showing stale data after save and reopen
- Refactor AppSwitcher to use loop instead of repetitive buttons
- Extract ToggleRow as reusable UI component
- Add domUtils for checking text-editable elements

src/utils/domUtils.ts

@@ -0,0 +1,11 @@
+export function isTextEditableTarget(target: EventTarget | null): boolean {
+  if (!(target instanceof HTMLElement)) return false;
+
+  const tagName = target.tagName;
+  return (
+    tagName === "INPUT" ||
+    tagName === "TEXTAREA" ||
+    tagName === "SELECT" ||
+    target.isContentEditable
+  );
+}