root 7f51af17a3 Add editor experience features: auto-run, layouts, resizable panels, Emmet, vim/emacs ...

- Auto-run toggle with localStorage persistence (toolbar checkbox)
- Layout selector: default, top/bottom, editor-only, preview-only
- Resizable panels via drag dividers with double-click reset
- Emmet abbreviation expansion for HTML, CSS, and JSX
- Vim and Emacs keybinding modes with lazy-loaded CDN libraries
- Shared preferences module for localStorage management
- Editor hooks for tab switch and mode change callbacks

2026-02-26 11:19:14 -06:00

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