Enhance file review status UI, improve error handling, and strengthen test coverage

[devarshishimpi]

Description

This PR improves the dashboard experience and system reliability by enhancing the file review status display, refactoring model error handling, and adding comprehensive test coverage. The changes focus on providing better visibility into review job progress and status while ensuring more robust error recovery and webhook handling.

Closes #8

What's Changed

UI/UX Improvements:

• Enhanced job logs page with detailed file review status cards showing individual file progress
• Improved job detail metadata cards with better visual hierarchy and responsive layout
• Added live review stepper UI for tracking multi-file review progress
• Enhanced Sonner toast notifications styling and job status indicators
• Better visual feedback for file status states (done, pending, failed, skipped)

Backend Improvements:

• Refactored model error handling with improved distinction between retryable and terminal errors
• Enhanced job recovery mechanisms with better lease expiration handling
• Improved webhook routing and error propagation
• Added retry delay escalation for transient model provider failures

Testing:

• Added comprehensive test coverage for model service error scenarios
• Added webhook handling tests for error cases
• Enhanced review flow tests with improved error handling verification

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (improving status visibility and error recovery)
• Refactoring (error handling and code organization)

How Has This Been Tested?

• Unit Tests - Added tests for model error handling, webhook routing, and review flow
• Manual Dashboard Verification - Tested job detail and logs page UI with various file review states
• Manual GitHub Webhook Verification - Verified webhook error handling and retry mechanisms

Checklist:

• I have starred Codra on GitHub
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have signed the CLA

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