feat: implement name system for finding UI elements (#39/40/41)

- Add 'name' property to UIDrawable base class
- All UI elements (Frame, Caption, Sprite, Grid, Entity) support .name
- Entity delegates name to its sprite member
- Add find(name, scene=None) function for exact match search
- Add findAll(pattern, scene=None) with wildcard support (* matches any sequence)
- Both functions search recursively through Frame children and Grid entities
- Comprehensive test coverage for all functionality

This provides a simple way to find UI elements by name in Python scripts,
supporting both exact matches and wildcard patterns.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

ROADMAP.md

@@ -166,13 +166,12 @@ Rendering Layer:
 ### Phase 4: Visibility & Performance (1-2 weeks)
 **Goal**: Only render/process what's needed
 ```
-1. #10 - Full visibility system with AABB
-   - bool visible() - False if outside view or hidden
-   - bool hidden - internal visibility toggle
-   - AABB() considers parent offsets recursively
-   - Non-visible elements can't be clicked
+1. #10 - [UNSCHEDULED] Full visibility system with AABB
+   - Postponed: UIDrawables can exist in multiple collections
+   - Cannot reliably determine screen position due to multiple render contexts
+   - Needs architectural solution for parent-child relationships
    
-2. #52 - Grid culling (if not done in Phase 2)
+2. #52 - Grid culling (COMPLETED in Phase 2)
    
 3. #39/40/41 - Name system for finding elements
    - name="button1" property on all UIDrawables