feat: add web frontend rules and design quality hook

rules/web/design-quality.md

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+> This file extends [common/patterns.md](../common/patterns.md) with web-specific design-quality guidance.
+
+# Web Design Quality Standards
+
+## Anti-Template Policy
+
+Do not ship generic template-looking UI. Frontend output should look intentional, opinionated, and specific to the product.
+
+### Banned Patterns
+
+- Default card grids with uniform spacing and no hierarchy
+- Stock hero section with centered headline, gradient blob, and generic CTA
+- Unmodified library defaults passed off as finished design
+- Flat layouts with no layering, depth, or motion
+- Uniform radius, spacing, and shadows across every component
+- Safe gray-on-white styling with one decorative accent color
+- Dashboard-by-numbers layouts with sidebar + cards + charts and no point of view
+- Default font stacks used without a deliberate reason
+
+### Required Qualities
+
+Every meaningful frontend surface should demonstrate at least four of these:
+
+1. Clear hierarchy through scale contrast
+2. Intentional rhythm in spacing, not uniform padding everywhere
+3. Depth or layering through overlap, shadows, surfaces, or motion
+4. Typography with character and a real pairing strategy
+5. Color used semantically, not just decoratively
+6. Hover, focus, and active states that feel designed
+7. Grid-breaking editorial or bento composition where appropriate
+8. Texture, grain, or atmosphere when it fits the visual direction
+9. Motion that clarifies flow instead of distracting from it
+10. Data visualization treated as part of the design system, not an afterthought
+
+## Before Writing Frontend Code
+
+1. Pick a specific style direction. Avoid vague defaults like "clean minimal".
+2. Define a palette intentionally.
+3. Choose typography deliberately.
+4. Gather at least a small set of real references.
+5. Use ECC design/frontend skills where relevant.
+
+## Worthwhile Style Directions
+
+- Editorial / magazine
+- Neo-brutalism
+- Glassmorphism with real depth
+- Dark luxury or light luxury with disciplined contrast
+- Bento layouts
+- Scrollytelling
+- 3D integration
+- Swiss / International
+- Retro-futurism
+
+Do not default to dark mode automatically. Choose the visual direction the product actually wants.
+
+## Component Checklist
+
+- [ ] Does it avoid looking like a default Tailwind or shadcn template?
+- [ ] Does it have intentional hover/focus/active states?
+- [ ] Does it use hierarchy rather than uniform emphasis?
+- [ ] Would this look believable in a real product screenshot?
+- [ ] If it supports both themes, do both light and dark feel intentional?