feat: add Tauri desktop app support and terminal management

packages/app/src/constants/layout.ts

@@ -1,3 +1,5 @@
+import { Platform } from "react-native";
+
 export const FOOTER_HEIGHT = 75;
 
 // Shared header inner height (excluding safe area insets and border)
@@ -7,3 +9,43 @@ export const HEADER_INNER_HEIGHT = 48;
 
 // Max width for chat content (stream view, input area, new agent form)
 export const MAX_CONTENT_WIDTH = 820;
+
+// Tauri desktop app constants for macOS traffic light buttons
+// These buttons (close/minimize/maximize) overlay the top-left corner
+export const TAURI_TRAFFIC_LIGHT_WIDTH = 78;
+export const TAURI_TRAFFIC_LIGHT_HEIGHT = 56;
+
+// Check if running in Tauri desktop app on macOS
+function isTauriMac(): boolean {
+  if (Platform.OS !== "web") return false;
+  if (typeof window === "undefined") return false;
+  if (!("__TAURI__" in window)) return false;
+  // Check for macOS via user agent
+  const ua = navigator.userAgent;
+  return ua.includes("Mac OS") || ua.includes("Macintosh");
+}
+
+// Cached result - only cache true, keep checking if false (in case __TAURI__ loads later)
+let _isTauriMacCached: boolean | null = null;
+
+export function getIsTauriMac(): boolean {
+  if (_isTauriMacCached === true) {
+    return true;
+  }
+  const result = isTauriMac();
+  if (result) {
+    _isTauriMacCached = true;
+  }
+  return result;
+}
+
+// Get traffic light padding values (only non-zero on Tauri macOS)
+export function getTrafficLightPadding(): { left: number; top: number } {
+  if (!getIsTauriMac()) {
+    return { left: 0, top: 0 };
+  }
+  return {
+    left: TAURI_TRAFFIC_LIGHT_WIDTH,
+    top: TAURI_TRAFFIC_LIGHT_HEIGHT,
+  };
+}