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.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
John McCardle
9f481a2e4a