Enhance Financial Advisor Branch Management and UI Consistency

[zhangfengcdt]

This PR significantly improves the branch management experience in the Financial Advisor example by adding real-time git integration, branch validation, and persistent client profiles.

Key Changes

🌿 Enhanced Branch Management

• Branch existence validation: Prevents creating duplicate branches with helpful error messages
• Smart command suggestions: Guides users to use switch for existing branches and branch for new ones
• Comprehensive branch listing: Added list-branches command with visual indicators

🏦 Real-time Git Integration

• Live branch display: UI now shows actual git branch from HEAD file, not cached state
• External git compatibility: Branch display updates immediately when external tools change branches
• Always-visible branch indicator: Shows [branch-name] for all branches including [main]

👤 Persistent Client Profiles

• Auto-save default profiles: New client profiles are now automatically saved to prevent recreation
• Branch-specific profiles: Each branch maintains its own client profile state
• Better user feedback: Clear messaging when profiles are created vs loaded

🛠️ Developer Experience

• Git-style commands: Added branch-info command that mimics git branch output format
• Branch mismatch detection: Debug warnings when cached vs actual branch state differs
• Robust git repository detection: Handles various git directory locations

New Commands

• switch - Switch to existing branch
• list-branches - Show all branches with fancy formatting
• branch-info - Git-style branch listing (undocumented/power-user command)