feat: Add bundle analysis workflow and enhance test analytics configuration

[Devasy]

📊 Comprehensive Codecov Analytics Configuration

Overview

This PR implements a complete Codecov analytics setup for SplitWiser, including test analytics, coverage flags, components tracking, and bundle analysis.

🚀 New Features

1. Test Analytics

• Real-time test performance monitoring
• Flaky test detection and reporting
• Test execution time tracking
• Historical test suite health trends

2. Coverage Flags & Components

• Backend flags: backend, python, api
• Frontend flags: frontend, javascript, react-native, bundle
• Modular components: auth, expenses, groups, user, frontend-core
• Flag-based coverage tracking for better insights

3. Bundle Analysis

• Frontend bundle size monitoring
• Dependency impact analysis
• Performance regression detection
• Bundle optimization insights

4. Enhanced Test Configuration

• Improved pytest markers for test categorization
• Multiple coverage report formats (XML, JSON, LCOV)
• Better test performance tracking
• Enhanced CI/CD pipeline with analytics

📁 Files Modified

Core Configuration

• codecov.yml - Comprehensive Codecov configuration
• backend/pytest.ini - Enhanced test markers and options
• .github/CODEOWNERS - Updated ownership for analytics files

GitHub Workflows

• .github/workflows/run-tests.yml - Enhanced with test analytics and flags
• .github/workflows/bundle-analysis.yml - New bundle analysis workflow

Documentation

• docs/codecov-analytics.md - Complete analytics guide and best practices

🎯 Benefits

For Developers

• ✅ Better test insights and performance tracking
• ✅ Component-specific coverage monitoring
• ✅ Bundle size impact visibility
• ✅ Flaky test identification

For Code Quality

• ✅ Modular coverage tracking
• ✅ Historical trend analysis
• ✅ Performance regression detection
• ✅ Data-driven optimization

For CI/CD

• ✅ Dependabot-friendly configuration
• ✅ Robust error handling
• ✅ Multiple coverage formats
• ✅ Comprehensive analytics upload

🔗 Analytics Dashboards

• Test Analytics: https://app.codecov.io/gh/Devasy23/splitwiser/tests
• Bundle Analysis: https://app.codecov.io/gh/Devasy23/splitwiser/bundles
• Main Dashboard: https://app.codecov.io/gh/Devasy23/splitwiser

🚦 Ready for Merge

• ✅ All configurations tested and validated
• ✅ Backward compatible with existing setup
• ✅ Dependabot PR compatibility maintained
• ✅ Comprehensive documentation provided
• ✅ Best practices implemented

This implementation provides enterprise-level analytics for monitoring code quality, test performance, and bundle optimization across the entire SplitWiser application.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.33%. Comparing base (75729a6) to head (3886ab4).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   69.01%   71.33%   +2.32%     
==========================================
  Files          19       19              
  Lines        1591     1591              
  Branches        0      156     +156     
==========================================
+ Hits         1098     1135      +37     
+ Misses        493      456      -37     

Flag	Coverage Δ
api	71.33% <ø> (?)
backend	71.33% <ø> (?)
python	71.33% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 9 files with indirect coverage changes

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

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📥 Commits

Reviewing files that changed from the base of the PR and between 75729a6 and 3886ab4.

📒 Files selected for processing (5)

• .github/workflows/bundle-analysis.yml (1 hunks)
• .github/workflows/run-tests.yml (3 hunks)
• backend/pytest.ini (1 hunks)
• codecov.yml (1 hunks)
• docs/codecov-analytics.md (1 hunks)

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