Fix Cmd+Q on macOS leaving the desktop app alive

The before-quit handler preventDefaulted on every quit and re-fired
app.quit() from .finally. That re-entered Electron through the
window-all-closed gate, which on macOS is a no-op listener that
vetoes the quit — so the window closed but the process stayed up.

Use app.exit(0) to bypass the close → window-all-closed → will-quit
chain entirely. Also drop the daemon-stop NSAlert: with no parent
window it ran app-modal and stalled the child-process pipes for
'paseo daemon stop', so daemon shutdown waited on the user dismissing
the dialog. Replace it with an in-app overlay rendered in the renderer
via a paseo:event:quitting IPC event. Stop opening DevTools on dev boot.

packages/app/src/app/_layout.tsx

@@ -29,6 +29,7 @@ import { UnistylesRuntime, useUnistyles } from "react-native-unistyles";
 import { CommandCenter } from "@/components/command-center";
 import { WorktreeSetupCalloutSource } from "@/components/worktree-setup-callout-source";
 import { DownloadToast } from "@/components/download-toast";
+import { QuittingOverlay } from "@/components/quitting-overlay";
 import { KeyboardShortcutsDialog } from "@/components/keyboard-shortcuts-dialog";
 import { LeftSidebar } from "@/components/left-sidebar";
 import { ProjectPickerModal } from "@/components/project-picker-modal";
@@ -479,6 +480,7 @@ function AppContainer({
       />
       <WorkspaceSetupDialog />
       <KeyboardShortcutsDialog />
+      <QuittingOverlay />
     </View>
   );
 

packages/app/src/components/quitting-overlay.tsx

@@ -0,0 +1,67 @@
+import { useEffect, useState } from "react";
+import { Text, View } from "react-native";
+import { StyleSheet, useUnistyles } from "react-native-unistyles";
+import { LoadingSpinner } from "@/components/ui/loading-spinner";
+import { getIsElectronRuntime } from "@/constants/layout";
+import { listenToDesktopEvent } from "@/desktop/electron/events";
+
+export function QuittingOverlay() {
+  const { theme } = useUnistyles();
+  const [quitting, setQuitting] = useState(false);
+
+  useEffect(() => {
+    if (!getIsElectronRuntime()) return;
+
+    let cancelled = false;
+    let unlisten: (() => void) | null = null;
+
+    void listenToDesktopEvent("quitting", () => {
+      if (!cancelled) setQuitting(true);
+    }).then((fn) => {
+      if (cancelled) {
+        fn();
+      } else {
+        unlisten = fn;
+      }
+      return undefined;
+    });
+
+    return () => {
+      cancelled = true;
+      unlisten?.();
+    };
+  }, []);
+
+  if (!quitting) return null;
+
+  return (
+    <View style={styles.overlay}>
+      <LoadingSpinner size="large" color={theme.colors.foregroundMuted} />
+      <Text style={styles.title}>Quitting Paseo…</Text>
+      <Text style={styles.detail}>Stopping the local daemon.</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create((theme) => ({
+  overlay: {
+    position: "absolute",
+    top: 0,
+    left: 0,
+    right: 0,
+    bottom: 0,
+    backgroundColor: theme.colors.surface1,
+    alignItems: "center",
+    justifyContent: "center",
+    gap: theme.spacing[3],
+    zIndex: 9999,
+  },
+  title: {
+    color: theme.colors.foreground,
+    fontSize: theme.fontSize.base,
+  },
+  detail: {
+    color: theme.colors.foregroundMuted,
+    fontSize: theme.fontSize.sm,
+  },
+}));