Fix Silent Failure Issues

[soovittt]

Description

Several operations fail silently without user notification, making debugging difficult.

Current State

• Status updates may fail silently (training/train.py:826-827)
• W&B loading may fail without notification
• Export may fail without feedback
• Cache operations may fail silently

Files Affected

• training/train.py - Status updates
• app/components/RunViewer.tsx - W&B loading
• Export functionality
• Cache operations

Expected Behavior

• All failures should be logged
• User notifications for important failures
• Retry mechanisms where appropriate
• Clear error messages
• Failure recovery options

Acceptance Criteria

• Fix silent status update failures
• Add error notifications for W&B loading
• Add error feedback for exports
• Add logging for all failures
• Add retry mechanisms
• Add user notifications
• Add tests