Now with 10K lines plain text, in release mode on macOS. The
`large-text` example can work with:
- 120 FPS for display.
- 90 FPS for update text.
```
MTL_HUD_ENABLED=1 cargo run --example large-text --release
```
- Fixed the cursor position at end of line, also support at start of
line.
https://github.com/user-attachments/assets/1de52f6c-e138-4ed3-a600-06372a807ed8
### Check list
- [x] Modifying Text with Rope
- [x] LineColumn, GoToLine
- [x] Code Highlight
- [x] Delete word, select word
- [x] Delete line
- [x] Move left, right, up, down
