feat: design system overhaul — sidebar, AI chats, settings, brainstorm, color cleanup

- Sidebar: dynamic brand-accent colors, brainstorm section restyled
- AI chat general: popup panel with expand/collapse, hides when contextual AI open
- AI chat contextual: tabs reordered (Actions first), X close button, height fix
- Settings: all tabs restyled, 6 new color presets (sage, terracotta, iron, etc.)
- Global color cleanup: emerald/orange hardcoded → brand-accent dynamic
- Brainstorm page: orange → brand-accent throughout
- PageEntry animation component added to key pages
- Floating AI button: bg-brand-accent instead of hardcoded black
- i18n: all 15 locales updated with new AI/billing keys
- Billing: freemium quota tracking, BYOK, stripe subscription scaffolding
- Admin: integrated into new design
- AGENTS.md + CLAUDE.md project rules added

.agent/skills/wds-4-ux-design/data/scenario-init/examples/booking-example.md

@@ -0,0 +1,64 @@
+# Example: Service Booking (Appointment Goal)
+
+**Trust-building booking flow**
+
+---
+
+## The 5 Questions
+
+### 1. Core Feature
+
+```
+"Consultation booking with social proof - testimonials + credentials"
+```
+
+### 2. Entry Point
+
+```
+"Friend recommendation (shared link)"
+```
+
+### 3. Mental State
+
+```
+"Curious but cautious, need to trust before committing time/money"
+```
+
+### 4. Mutual Success
+
+```
+Business: Consultation booked (lead captured)
+User: Confident in decision, looking forward to meeting
+```
+
+### 5. Shortest Path
+
+```
+Friend link → About page → Testimonials →
+Book consultation → Confirmation
+```
+
+---
+
+## Scenario Captured
+
+```
+SCENARIO: Trust-Building Booking
+
+START: Friend recommendation (curious but cautious)
+END: Consultation booked (confident, excited)
+
+CRITICAL PATH:
+1. About page → Understand who you are
+2. Testimonials → See social proof
+3. Credentials → Verify expertise
+4. Book consultation → Commit with confidence
+5. Confirmation → Excitement reinforced
+
+BUSINESS GOAL: Consultation booked
+USER GOAL: Confident decision, trust established
+```
+
+---
+
+[← Back to Guide](../00-SCENARIO-INIT-GUIDE.md)