fix: add babel-preset-expo devDependency and babel.config.js

Without this, Metro fails to bundle because the preset is not found.
Verified: npx expo export --platform android now bundles 1093 modules clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mobile/package-lock.json

@@ -27,7 +27,9 @@
         "react-native-track-player": "^5.0.0-alpha0",
         "zustand": "^5.0.14"
       },
-      "devDependencies": {}
+      "devDependencies": {
+        "babel-preset-expo": "^56.0.14"
+      }
     },
     "node_modules/@babel/code-frame": {
       "version": "7.29.7",
@@ -2217,6 +2219,73 @@
         "@babel/plugin-syntax-flow": "^7.12.1"
       }
     },
+    "node_modules/babel-preset-expo": {
+      "version": "56.0.14",
+      "resolved": "https://registry.npmjs.org/babel-preset-expo/-/babel-preset-expo-56.0.14.tgz",
+      "integrity": "sha512-+JKVMYf3HajO3tPRA9DlKd/VhZOPTHyTzUo2yZajfMAoQ3l5VEdGVxm2MzX4DXMNKXwsC8GOeTRx7CrO/5dBDA==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/generator": "^7.20.5",
+        "@babel/helper-module-imports": "^7.25.9",
+        "@babel/plugin-proposal-decorators": "^7.12.9",
+        "@babel/plugin-proposal-export-default-from": "^7.24.7",
+        "@babel/plugin-syntax-dynamic-import": "^7.8.3",
+        "@babel/plugin-syntax-export-default-from": "^7.24.7",
+        "@babel/plugin-syntax-nullish-coalescing-operator": "^7.8.3",
+        "@babel/plugin-syntax-optional-chaining": "^7.8.3",
+        "@babel/plugin-transform-async-generator-functions": "^7.25.4",
+        "@babel/plugin-transform-async-to-generator": "^7.24.7",
+        "@babel/plugin-transform-block-scoping": "^7.25.0",
+        "@babel/plugin-transform-class-properties": "^7.25.4",
+        "@babel/plugin-transform-class-static-block": "^7.27.1",
+        "@babel/plugin-transform-classes": "^7.25.4",
+        "@babel/plugin-transform-destructuring": "^7.24.8",
+        "@babel/plugin-transform-export-namespace-from": "^7.25.9",
+        "@babel/plugin-transform-flow-strip-types": "^7.25.2",
+        "@babel/plugin-transform-for-of": "^7.24.7",
+        "@babel/plugin-transform-logical-assignment-operators": "^7.24.7",
+        "@babel/plugin-transform-modules-commonjs": "^7.24.8",
+        "@babel/plugin-transform-named-capturing-groups-regex": "^7.24.7",
+        "@babel/plugin-transform-nullish-coalescing-operator": "^7.24.7",
+        "@babel/plugin-transform-object-rest-spread": "^7.24.7",
+        "@babel/plugin-transform-optional-catch-binding": "^7.24.7",
+        "@babel/plugin-transform-optional-chaining": "^7.24.8",
+        "@babel/plugin-transform-parameters": "^7.24.7",
+        "@babel/plugin-transform-private-methods": "^7.24.7",
+        "@babel/plugin-transform-private-property-in-object": "^7.24.7",
+        "@babel/plugin-transform-react-display-name": "^7.24.7",
+        "@babel/plugin-transform-react-jsx": "^7.28.6",
+        "@babel/plugin-transform-react-jsx-development": "^7.27.1",
+        "@babel/plugin-transform-react-pure-annotations": "^7.27.1",
+        "@babel/plugin-transform-runtime": "^7.24.7",
+        "@babel/plugin-transform-typescript": "^7.25.2",
+        "@babel/plugin-transform-unicode-regex": "^7.24.7",
+        "@babel/preset-typescript": "^7.23.0",
+        "@react-native/babel-plugin-codegen": "0.85.3",
+        "babel-plugin-react-compiler": "^1.0.0",
+        "babel-plugin-react-native-web": "~0.21.0",
+        "babel-plugin-syntax-hermes-parser": "^0.33.3",
+        "babel-plugin-transform-flow-enums": "^0.0.2",
+        "debug": "^4.3.4"
+      },
+      "peerDependencies": {
+        "@babel/runtime": "^7.20.0",
+        "expo": "*",
+        "expo-widgets": "^56.0.16",
+        "react-refresh": ">=0.14.0 <1.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@babel/runtime": {
+          "optional": true
+        },
+        "expo": {
+          "optional": true
+        },
+        "expo-widgets": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/balanced-match": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
@@ -3221,73 +3290,6 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/expo/node_modules/babel-preset-expo": {
-      "version": "56.0.14",
-      "resolved": "https://registry.npmjs.org/babel-preset-expo/-/babel-preset-expo-56.0.14.tgz",
-      "integrity": "sha512-+JKVMYf3HajO3tPRA9DlKd/VhZOPTHyTzUo2yZajfMAoQ3l5VEdGVxm2MzX4DXMNKXwsC8GOeTRx7CrO/5dBDA==",
-      "license": "MIT",
-      "dependencies": {
-        "@babel/generator": "^7.20.5",
-        "@babel/helper-module-imports": "^7.25.9",
-        "@babel/plugin-proposal-decorators": "^7.12.9",
-        "@babel/plugin-proposal-export-default-from": "^7.24.7",
-        "@babel/plugin-syntax-dynamic-import": "^7.8.3",
-        "@babel/plugin-syntax-export-default-from": "^7.24.7",
-        "@babel/plugin-syntax-nullish-coalescing-operator": "^7.8.3",
-        "@babel/plugin-syntax-optional-chaining": "^7.8.3",
-        "@babel/plugin-transform-async-generator-functions": "^7.25.4",
-        "@babel/plugin-transform-async-to-generator": "^7.24.7",
-        "@babel/plugin-transform-block-scoping": "^7.25.0",
-        "@babel/plugin-transform-class-properties": "^7.25.4",
-        "@babel/plugin-transform-class-static-block": "^7.27.1",
-        "@babel/plugin-transform-classes": "^7.25.4",
-        "@babel/plugin-transform-destructuring": "^7.24.8",
-        "@babel/plugin-transform-export-namespace-from": "^7.25.9",
-        "@babel/plugin-transform-flow-strip-types": "^7.25.2",
-        "@babel/plugin-transform-for-of": "^7.24.7",
-        "@babel/plugin-transform-logical-assignment-operators": "^7.24.7",
-        "@babel/plugin-transform-modules-commonjs": "^7.24.8",
-        "@babel/plugin-transform-named-capturing-groups-regex": "^7.24.7",
-        "@babel/plugin-transform-nullish-coalescing-operator": "^7.24.7",
-        "@babel/plugin-transform-object-rest-spread": "^7.24.7",
-        "@babel/plugin-transform-optional-catch-binding": "^7.24.7",
-        "@babel/plugin-transform-optional-chaining": "^7.24.8",
-        "@babel/plugin-transform-parameters": "^7.24.7",
-        "@babel/plugin-transform-private-methods": "^7.24.7",
-        "@babel/plugin-transform-private-property-in-object": "^7.24.7",
-        "@babel/plugin-transform-react-display-name": "^7.24.7",
-        "@babel/plugin-transform-react-jsx": "^7.28.6",
-        "@babel/plugin-transform-react-jsx-development": "^7.27.1",
-        "@babel/plugin-transform-react-pure-annotations": "^7.27.1",
-        "@babel/plugin-transform-runtime": "^7.24.7",
-        "@babel/plugin-transform-typescript": "^7.25.2",
-        "@babel/plugin-transform-unicode-regex": "^7.24.7",
-        "@babel/preset-typescript": "^7.23.0",
-        "@react-native/babel-plugin-codegen": "0.85.3",
-        "babel-plugin-react-compiler": "^1.0.0",
-        "babel-plugin-react-native-web": "~0.21.0",
-        "babel-plugin-syntax-hermes-parser": "^0.33.3",
-        "babel-plugin-transform-flow-enums": "^0.0.2",
-        "debug": "^4.3.4"
-      },
-      "peerDependencies": {
-        "@babel/runtime": "^7.20.0",
-        "expo": "*",
-        "expo-widgets": "^56.0.16",
-        "react-refresh": ">=0.14.0 <1.0.0"
-      },
-      "peerDependenciesMeta": {
-        "@babel/runtime": {
-          "optional": true
-        },
-        "expo": {
-          "optional": true
-        },
-        "expo-widgets": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/expo/node_modules/ci-info": {
       "version": "3.9.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.9.0.tgz",

mobile/package.json

@@ -29,5 +29,7 @@
     "web": "expo start --web"
   },
   "private": true,
-  "devDependencies": {}
+  "devDependencies": {
+    "babel-preset-expo": "^56.0.14"
+  }
 }