Refined the UI and improved overall stability.

◇ Limits Removed
① Expanded maximum canvas size from 256×256 to 1024×1024 (this app is designed for small pixel art, so it is not well-suited for large canvases).

◇ Improvements
① Improved performance for 1024×1024 canvases, including photo import/loading and pixel art border rendering.
② Drag-and-drop reordering of animation frames.

◇ Bug Fixes
① Fixed a bug where animation buttons overlapped in Portuguese/Russian.
② Other minor bug fixes.