feat(MCN工作台): 数据功能页+图标扁平化+多项UI优化

- 工作台大版本升级：hash 路由 + 6 数据功能页（周榜/热门账号/账号详情/视频详情/AI写脚本/AI写作复盘），只读复用 dsh 库副本 + 抖音榜单 JSON
- 数据库隔离：复制 dsh 库到 mcn-work-shop/，与 dsh 原库各访问各的（已 gitignore）
- 图标全面扁平化：Lucide 线性 SVG，功能图标亮色区分，文字标题去图标
- 首页重构：功能入口卡 + AI写剧本快捷卡片(2列/8个/5行预览) + 独立帮助页 + header 精简
- 新增设计技能 impeccable + taste-skill（生成网页时参考）
- 修复：fmtTime 跨 script 全局冲突(P0)、弹窗关闭、外链新标签打开等

.workbuddy/skills/impeccable/reference/quieter.md

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+Quiet design is harder than bold design. Subtlety needs precision. Reduce visual intensity in designs that are too loud, aggressive, or overstimulating without losing personality or making the result generic.
+
+---
+
+## Visitor mode
+
+Persuade + Experience: "quieter" means more restrained palette, more whitespace, more typographic air. Drama is reduced, not eliminated; the POV stays intact.
+
+Operate + Read: "quieter" means reducing visual noise. Fewer background accents, flatter cards, less color, less motion. The tool should disappear more completely into the task.
+
+---
+
+## Assess Current State
+
+Analyze what makes the design feel too intense:
+
+1. **Identify intensity sources**:
+   - **Color saturation**: Overly bright or saturated colors
+   - **Contrast extremes**: Too much high-contrast juxtaposition
+   - **Visual weight**: Too many bold, heavy elements competing
+   - **Animation excess**: Too much motion or overly dramatic effects
+   - **Complexity**: Too many visual elements, patterns, or decorations
+   - **Scale**: Everything is large and loud with no hierarchy
+
+2. **Understand the context**:
+   - What's the purpose? (Marketing vs tool vs reading experience)
+   - Who's the audience? (Some contexts need energy)
+   - What's working? (Don't throw away good ideas)
+   - What's the core message? (Preserve what matters)
+
+If any of these are unclear from the codebase, {{ask_instruction}}
+
+**CRITICAL**: "Quieter" doesn't mean boring or generic. It means refined and easier on the eyes. Think luxury, not laziness.
+
+## Plan Refinement
+
+Create a strategy to reduce intensity while maintaining impact:
+
+- **Color approach**: Desaturate or shift to more restrained tones?
+- **Hierarchy approach**: Which elements should stay bold (very few), which should recede?
+- **Simplification approach**: What can be removed entirely?
+- **Sophistication approach**: How can we signal quality through restraint?
+
+**IMPORTANT**: Subtlety requires precision. Quiet without intent collapses to generic.
+
+## Refine the Design
+
+Systematically reduce intensity across these dimensions:
+
+### Color Refinement
+- **Reduce saturation**: Shift from fully saturated to 70-85% saturation
+- **Soften palette**: Replace bright colors with muted tones
+- **Reduce color variety**: Use fewer colors more thoughtfully
+- **Neutral dominance**: Let neutrals do more work, use color as accent (10% rule)
+- **Gentler contrasts**: High contrast only where it matters most
+- **Tinted grays**: Use warm or cool tinted grays instead of pure gray. Adds depth without loudness
+- **Never gray on color**: If you have gray text on a colored background, use a darker shade of that color or transparency instead
+
+### Visual Weight Reduction
+- **Typography**: Reduce font weights (900 → 600, 700 → 500), decrease sizes where appropriate
+- **Hierarchy through subtlety**: Use weight, size, and space instead of color and boldness
+- **White space**: Increase breathing room, reduce density
+- **Borders & lines**: Reduce thickness, decrease opacity, or remove entirely
+
+### Simplification
+- **Remove decorative elements**: Gradients, shadows, patterns, textures that don't serve purpose
+- **Simplify shapes**: Reduce border radius extremes, simplify custom shapes
+- **Reduce layering**: Flatten visual hierarchy where possible
+- **Clean up effects**: Reduce or remove blur effects, glows, multiple shadows
+
+### Motion Reduction
+- **Reduce animation intensity**: Shorter distances (10-20px instead of 40px), gentler easing
+- **Remove decorative animations**: Keep functional motion, remove flourishes
+- **Subtle micro-interactions**: Replace dramatic effects with gentle feedback
+- **Refined easing**: Use ease-out-quart for smooth, understated motion. Never bounce or elastic
+- **Remove animations entirely** if they're not serving a clear purpose
+
+### Composition Refinement
+- **Reduce scale jumps**: Smaller contrast between sizes creates calmer feeling
+- **Align to grid**: Bring rogue elements back into systematic alignment
+- **Even out spacing**: Replace extreme spacing variations with consistent rhythm
+
+**NEVER**:
+- Make everything the same size/weight (hierarchy still matters)
+- Remove all color (quiet ≠ grayscale)
+- Eliminate all personality (maintain character through refinement)
+- Sacrifice usability for aesthetics (functional elements still need clear affordances)
+- Make everything small and light (some anchors needed)
+
+## Verify Quality
+
+Ensure refinement maintains quality:
+
+- **Still functional**: Can users still accomplish tasks easily?
+- **Still distinctive**: Does it have character, or is it generic now?
+- **Better reading**: Is text easier to read for extended periods?
+- **Restrained, not absent**: Does the POV survive the cuts?
+
+When the result feels right, hand off to `{{command_prefix}}impeccable polish` for the final pass.