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.

.cursor/rules/markdown.mdc

@@ -312,3 +312,21 @@ Description of current situation or problem.
 **Last Updated**: 2025-07-09
 **Version**: 1.0
 **Maintainer**: Matthew Raymer
+
+
+### Heading Uniqueness
+
+- **Rule**: No duplicate heading content at the same level
+- **Scope**: Within a single document
+- **Rationale**: Maintains clear document structure and navigation
+- **Example**:
+
+  ```markdown
+  ## Features        ✅
+  ### Authentication
+  ### Authorization
+
+  ## Features        ❌ (Duplicate heading)
+  ### Security
+  ### Performance
+  ```