docs: add comprehensive GiftedDialog architecture overview
Add detailed analysis of GiftedDialog component architecture including:
- DRY and SOLID principles compliance assessment
- Cognitive load analysis with before/after comparisons
- Architectural complexity remediation plan
- Phased implementation strategy (cognitive load → composable architecture)
- Component hierarchy and dependency analysis
- Performance and security considerations
The document provides actionable recommendations for reducing complexity
while maintaining functionality, with specific code examples and metrics.
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