Fix progress bar threading, status display, and PDF token estimation

[agamm]

Summary

• Fixed progress bar threading issues and duplicate status prints
• Enhanced status bar with better failure handling and mixed progress bars
• Improved PDF token estimation with provider-specific calculations

Changes

• Progress bar threading: Added _progress_lock and rate limiting to prevent race conditions and duplicate prints
• Status display: Enhanced progress bars to show success/failure proportions, improved status text formatting
• PDF token estimation: Simplified to use provider-specific tokens per page (Anthropic: 2000, OpenAI: 1000, Gemini: 258)
• Rich display: Disabled auto-refresh and added manual refresh synchronization

Test plan

• Progress bars display correctly without flickering
• Status updates are rate-limited and synchronized
• PDF token estimation uses appropriate provider-specific values
• Mixed success/failure batches show proper progress indication

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