Editor Refinements

The editor needed UX polish and missing features to be usable for real work — grid was hard to see, no preview, no way to save/load items, and limited tooling.

Refine the editor with visual fixes, new tools, a live preview, and a library system for saving and organizing items.

• Grid visibility
• Live preview panel
• New tools (recolor, brush size)
• Item library with localStorage persistence + JSON import/export
• Canvas size controls

• Grid lines brightened — border opacity 0.04 → 0.10
• Live preview — upper-right panel with adjustable font size (1–60px)
• Recolor tool — change cell color without changing character
• Brush size — slider (1–5) with hover preview overlay on grid
• Library system — localStorage-based with folders, save/load/delete/download/import
• Grid size sliders — replaced dropdown with row/col range sliders in bottom bar
• Layout — grid left-aligned, library sidebar on left, preview upper-right

Editor is now a functional tool with persistence. Items can be saved to localStorage, organized into folders, downloaded as JSON for file-based persistence, and imported back. Multiple brush sizes and recolor tool make painting faster.