refactor(modal): replace bottom sheet with native modal and custom animations
Replace @gorhom/bottom-sheet with React Native's native Modal component and implement custom slide-in/slide-out animations using Reanimated. This provides better control over modal behavior and animations while reducing dependency on external libraries. Key changes: - Replace BottomSheetModal with native Modal component - Implement custom slide animations using Reanimated shared values - Add backdrop fade in/out animations - Extract modal sections into focused components (ModalHeader, WorkingDirectorySection, AssistantSelector, ModeSelector, WorktreeSection) - Add responsive layout support with compact/wide screen detection - Fix keyboard animation to use transform instead of padding - Improve modal lifecycle management with mount/unmount state tracking 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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