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/ui_Grid_none_texture_test.py

@@ -7,24 +7,24 @@ import sys
 def test_grid_none_texture(runtime):
     """Test Grid functionality without texture"""
     print("\n=== Testing Grid with None texture ===")
-    
+
     # Test 1: Create Grid with None texture
     try:
-        grid = mcrfpy.Grid(10, 10, None, mcrfpy.Vector(50, 50), mcrfpy.Vector(400, 400))
+        grid = mcrfpy.Grid(grid_size=(10, 10), pos=(50, 50), size=(400, 400))
         print("✓ Grid created successfully with None texture")
     except Exception as e:
         print(f"✗ Failed to create Grid with None texture: {e}")
         sys.exit(1)
-    
+
     # Add to UI
     ui = mcrfpy.sceneUI("grid_none_test")
     ui.append(grid)
-    
+
     # Test 2: Verify grid properties
     try:
         grid_size = grid.grid_size
         print(f"✓ Grid size: {grid_size}")
-        
+
         # Check texture property
         texture = grid.texture
         if texture is None:
@@ -33,39 +33,41 @@ def test_grid_none_texture(runtime):
             print(f"✗ Grid texture should be None, got: {texture}")
     except Exception as e:
         print(f"✗ Property access failed: {e}")
-    
-    # Test 3: Access grid points and set colors
+
+    # Test 3: Access grid points using ColorLayer (new API)
+    # Note: GridPoint no longer has .color - must use ColorLayer system
     try:
+        # Add a color layer to the grid
+        color_layer = grid.add_layer("color", z_index=-1)
         # Create a checkerboard pattern with colors
         for x in range(10):
             for y in range(10):
-                point = grid.at(x, y)
                 if (x + y) % 2 == 0:
-                    point.color = mcrfpy.Color(255, 0, 0, 255)  # Red
+                    color_layer.set(x, y, mcrfpy.Color(255, 0, 0, 255))  # Red
                 else:
-                    point.color = mcrfpy.Color(0, 0, 255, 255)  # Blue
-        print("✓ Successfully set grid point colors")
+                    color_layer.set(x, y, mcrfpy.Color(0, 0, 255, 255))  # Blue
+        print("✓ Successfully set grid colors via ColorLayer")
     except Exception as e:
         print(f"✗ Failed to set grid colors: {e}")
-    
+
     # Test 4: Add entities to the grid
     try:
         # Create an entity with its own texture
         entity_texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
-        entity = mcrfpy.Entity(mcrfpy.Vector(5, 5), entity_texture, 1, grid)
+        entity = mcrfpy.Entity((5, 5), texture=entity_texture, sprite_index=1, grid=grid)
         grid.entities.append(entity)
         print(f"✓ Added entity to grid, total entities: {len(grid.entities)}")
     except Exception as e:
         print(f"✗ Failed to add entity: {e}")
-    
+
     # Test 5: Test grid interaction properties
     try:
         # Test zoom
         grid.zoom = 2.0
         print(f"✓ Set zoom to: {grid.zoom}")
-        
-        # Test center
-        grid.center = mcrfpy.Vector(5, 5)
+
+        # Test center (uses pixel coordinates)
+        grid.center = (200, 200)
         print(f"✓ Set center to: {grid.center}")
     except Exception as e:
         print(f"✗ Grid properties failed: {e}")
@@ -86,7 +88,7 @@ mcrfpy.setScene("grid_none_test")
 
 # Add a background frame so we can see the grid
 ui = mcrfpy.sceneUI("grid_none_test")
-background = mcrfpy.Frame(0, 0, 800, 600,
+background = mcrfpy.Frame(pos=(0, 0), size=(800, 600),
                          fill_color=mcrfpy.Color(200, 200, 200),
                          outline_color=mcrfpy.Color(0, 0, 0),
                          outline=2.0)