feat(web): revamp style modal UI with grid cards, thumbnails, and dual-view

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>

lib/options.ts

@@ -9,22 +9,27 @@ export const GENDERS = ["男性向", "女性向"] as const;
 
 export const ART_STYLES = [
   "自动",
-  "自定义",
-  "京阿尼细腻日常",
-  "新海诚唯美光影",
-  "Galgame CG",
-  "3D 动漫电影",
+  "自定义风格",
+  "京阿尼",
+  "新海诚",
+  "吉卜力",
+  "3D 动画",
+  "真实",
   "赛博朋克",
-  "蒸汽波",
-  "吉卜力治愈手绘",
-  "哥特庄园",
-  "废土科幻",
-  // 以下为小众/区域性画风，留作长尾选项
-  "古典厚涂油画",
-  "极简中国水墨",
-  "浮世绘木刻",
-  "莫高窟壁画",
-  "波斯细密画",
+  "哥特",
+  "废土",
+  "像素风",
+  "古典油画",
+  "莫奈",
+  "水彩",
+  "水墨",
+  "浮世绘",
+  "彩铅",
+  "手绘素描",
+  "黑白漫画",
+  "儿童绘本",
+  "儿童涂鸦",
+  "黏土手工",
 ] as const;
 
 export const PLOT_STYLES = ["平铺直叙", "多线转折", "悬疑烧脑", "治愈日常"] as const;