feat(desktop): wrap the web client in a Tauri app

EOF

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/desktop/src-tauri/capabilities/main.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "main",
+  "description": "Only the bundled main window may invoke desktop integration.",
+  "windows": ["main"],
+  "permissions": ["core:default", "core:event:default"]
+}