Add GitHub Actions CI workflow with Flutter stable for Dart 3.8.1+ support

[Copilot]

Problem

The repository was experiencing CI failures (job 46730560486) due to a Dart version mismatch. The project's pubspec.yaml requires Dart ^3.8.1, but the CI environment was running with Dart 3.4.4, causing dependency resolution failures.

Solution

Created a new GitHub Actions workflow (.github/workflows/flutter_ci.yml) that:

• Uses the stable Flutter channel to ensure Dart 3.8.1+ compatibility
• Implements standard Flutter CI pipeline with proper dependency management
• Includes version verification for debugging future compatibility issues

Changes

# .github/workflows/flutter_ci.yml
name: Flutter CI

on:
  push:
    branches: [ main, master ]
  pull_request:
    branches: [ main, master ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - name: Setup Flutter
      uses: subosito/flutter-action@v2
      with:
        flutter-version: 'stable'
        channel: 'stable'
    - name: Get dependencies
      run: flutter pub get
    - name: Verify Flutter version
      run: |
        flutter --version
        dart --version
    - name: Analyze project source
      run: flutter analyze
    - name: Run tests
      run: flutter test

Benefits

• ✅ Resolves Dart version compatibility issues
• ✅ Ensures CI runs with Dart 3.8.1 or newer
• ✅ Provides version debugging information
• ✅ Implements complete Flutter CI pipeline (dependencies, analysis, testing)
• ✅ Uses latest stable Flutter for maximum compatibility

This addresses the root cause of CI failures by ensuring the workflow uses a Flutter version that includes the required Dart SDK version specified in pubspec.yaml.

This pull request was created as a result of the following prompt from Copilot chat.

Update the GitHub Actions workflow file (.github/workflows/flutter_ci.yml) to use a Flutter version that includes Dart 3.8.1 or newer, as required by the project's pubspec. This resolves the version solving failure seen in CI job 46730560486, where the workflow ran with Dart 3.4.4, but the project requires Dart ^3.8.1. Use a Flutter version such as 3.22.1 or the latest stable that includes Dart 3.8.1+. Example change:

• uses: subosito/flutter-action@v2
  with:
  flutter-version: '3.22.1'

Commit this change to fix the CI failure.

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