feat: use mnemonic-id for worktree names

Replace prompt-based slugifying with mnemonic-id package for generating
human-readable worktree names like "hungry-hippo". Names are generated
when the worktree toggle is enabled rather than derived from the prompt.

packages/app/package.json

@@ -15,7 +15,6 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@paseo/server": "*",
     "@boudra/expo-two-way-audio": "^0.1.3",
     "@expo/vector-icons": "^15.0.2",
     "@gorhom/bottom-sheet": "^5.2.6",
@@ -27,6 +26,7 @@
     "@lezer/json": "^1.0.3",
     "@lezer/markdown": "^1.6.2",
     "@lezer/python": "^1.1.18",
+    "@paseo/server": "*",
     "@react-native-async-storage/async-storage": "2.2.0",
     "@react-navigation/bottom-tabs": "^7.4.0",
     "@react-navigation/elements": "^2.6.3",
@@ -55,6 +55,7 @@
     "expo-updates": "~29.0.12",
     "expo-web-browser": "~15.0.8",
     "lucide-react-native": "^0.546.0",
+    "mnemonic-id": "^3.2.7",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "react-native": "^0.81.5",