fix: Modernize Expo app and fix CI workflows (#201)

This commit modernizes the Expo application by upgrading the Expo SDK to version 53 and updating all relevant dependencies to be compatible with the new SDK. It also fixes the CI/CD workflows that were failing due to a recent folder name change from `frontend` to `mobile`.

The following changes were made:
- Updated `expo` to `~53.0.20` and other dependencies to compatible versions.
- Updated the `working-directory` and `paths` in `.github/workflows/preview.yml` and `.github/workflows/rn-bundle-analysis.yml` from `frontend` to `mobile`.
- Updated the package name in `mobile/package.json` from `frontend` to `mobile`.

The application was successfully built and run after the changes.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: google-labs-jules[bot]

.github/workflows/preview.yml

@@ -29,10 +29,10 @@ jobs:
 
       - name: Install dependencies
         run: npm install
-        working-directory: ./frontend
+        working-directory: mobile/
 
       - name: Create preview
         uses: expo/expo-github-action/preview@v8
         with:
           command: eas update --auto --branch ${{ github.event.pull_request.head.ref }}
-          working-directory: ./frontend
+          working-directory: mobile/

.github/workflows/rn-bundle-analysis.yml

@@ -3,11 +3,11 @@ name: React Native Bundle Analysis
 on:
   pull_request:
     paths:
-      - 'frontend/**'
+      - 'mobile/**'
     branches: [ main, master ]
   push:
     paths:
-      - 'frontend/**'
+      - 'mobile/**'
     branches: [ main, master ]
 
 jobs:
@@ -24,7 +24,7 @@ jobs:
       with:
         node-version: '18'
         cache: 'npm'
-        cache-dependency-path: frontend/package-lock.json
+        cache-dependency-path: mobile/package-lock.json
 
     - name: Setup EAS
       uses: expo/expo-github-action@v8
@@ -34,10 +34,10 @@ jobs:
 
     - name: Install Dependencies
       run: npm install
-      working-directory: ./frontend
+      working-directory: mobile/
 
     - name: Analyze React Native Bundle Size
-      working-directory: ./frontend
+      working-directory: mobile/
       run: |
         echo "📊 Analyzing React Native bundle size..."
         
@@ -105,11 +105,11 @@ jobs:
         fi
 
     - name: Upload RN Bundle Analysis Report
-      if: always() && hashFiles('frontend/bundle-analysis.md') != ''
+      if: always() && hashFiles('mobile/bundle-analysis.md') != ''
       uses: actions/upload-artifact@v4
       with:
         name: rn-bundle-analysis-report
-        path: frontend/bundle-analysis.md
+        path: mobile/bundle-analysis.md
         retention-days: 30
 
     - name: RN Bundle Analysis Skipped