fix: Update test files to use current API patterns

Migrates test suite to current API:
- Frame(x, y, w, h) → Frame(pos=(x, y), size=(w, h))
- Caption("text", x, y) → Caption(pos=(x, y), text="text")
- caption.size → caption.font_size
- Entity(x, y, ...) → Entity((x, y), ...)
- Grid(w, h, ...) → Grid(grid_size=(w, h), ...)
- cell.color → ColorLayer system

Tests now serve as valid API usage examples.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/unit/test_scene_transitions_headless.py

@@ -13,13 +13,13 @@ def test_scene_transitions():
     # Scene 1
     mcrfpy.createScene("scene1")
     ui1 = mcrfpy.sceneUI("scene1")
-    frame1 = mcrfpy.Frame(0, 0, 100, 100, fill_color=mcrfpy.Color(255, 0, 0))
+    frame1 = mcrfpy.Frame(pos=(0, 0), size=(100, 100), fill_color=mcrfpy.Color(255, 0, 0))
     ui1.append(frame1)
-    
-    # Scene 2 
+
+    # Scene 2
     mcrfpy.createScene("scene2")
     ui2 = mcrfpy.sceneUI("scene2")
-    frame2 = mcrfpy.Frame(0, 0, 100, 100, fill_color=mcrfpy.Color(0, 0, 255))
+    frame2 = mcrfpy.Frame(pos=(0, 0), size=(100, 100), fill_color=mcrfpy.Color(0, 0, 255))
     ui2.append(frame2)
     
     # Test each transition type