Redesign the painting-style picker inspired by Pollo AI: widen modal to
1400px, show styles as square thumbnail cards in a 4-column grid with
name labels below, add ember glow hover effect, and split custom-style
editing into its own view. Simplify style names (e.g. "京阿尼细腻日常" →
"京阿尼"), add 22 .webp preview thumbnails, and remove the per-preset
override mechanism in favor of a cleaner grid + custom flow.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>