v0.63.0: Model selector redesign, session default settings, and Droid Shield improvements

New features

- Top 5 model selector - Model selector now shows top 5 models with a "show more" option for cleaner UI
- Session default settings - All session default settings (model, autonomy, reasoning) now exposed in /settings menu

Bug fixes

- Droid Shield false positives - Reduced false positives on example files and placeholders
- Glob tool patterns - Fixed handling of non-array patterns input in Glob tool
- BYOK auth in exec mode - Fixed authentication validation for BYOK custom models in exec mode
- Session model auth - Check effective session model for BYOK auth skip, not just CLI flag
- Session loading - Fixed session loading issues with long conversation histories