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-8-product-evolution/data/kaizen-iteration-guide.md

@@ -0,0 +1,167 @@
+# Step 08: Iterate (Kaizen Never Stops)
+
+## Your Task
+
+Use learnings from this cycle to identify and start the next improvement.
+
+---
+
+## Before You Start
+
+**Ensure you have:**
+
+- ✅ Completed step 07 (impact measured)
+- ✅ Impact report created
+- ✅ Learnings documented
+- ✅ Results shared with team
+
+---
+
+## The Kaizen Philosophy
+
+**改善 (Kaizen) = Continuous Improvement**
+
+```
+Ship → Monitor → Learn → Improve → Ship → Monitor → Learn...
+                            ↑
+                       You are here!
+```
+
+**This cycle never stops!**
+
+**See:** [data/kaizen-principles.md](../data/kaizen-principles.md) for Kaizen vs Kaikaku and core principles
+
+---
+
+## Review Your Learnings
+
+### From Impact Report
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for Learnings Documentation template
+
+Key questions:
+- What worked?
+- What didn't work?
+- What patterns are emerging?
+- What hypotheses were validated/rejected?
+- What new questions arose?
+
+---
+
+## Identify Next Opportunity
+
+**Three sources for next improvement:**
+
+### 1. Iterate on Current Update
+
+If the update was partially successful - refine it.
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for "Iterate on Current Update" template
+
+### 2. Apply Pattern to Similar Feature
+
+If the update was successful - apply the pattern elsewhere.
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for "Apply Pattern" template
+
+### 3. Address New Problem
+
+From monitoring and feedback - tackle new issues.
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for "New Problem" template
+
+---
+
+## Prioritize Next Cycle
+
+**Use Kaizen prioritization:**
+
+### Priority = Impact × Effort × Learning
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for Kaizen Prioritization template
+
+---
+
+## Start Next Cycle
+
+**Return to Step 01 with your next opportunity:**
+
+```
+[M] Return to Activity Menu — start next cycle with [A] Analyze Product
+```
+
+**See:** [data/monitoring-templates.md](../data/monitoring-templates.md) for Kaizen Cycle Log template
+
+---
+
+## Completion
+
+**Phase 8 is complete when:**
+
+- ✅ Improvement identified
+- ✅ Context gathered
+- ✅ Update designed
+- ✅ Delivery created
+- ✅ Handed off to BMad
+- ✅ Implementation validated
+- ✅ Impact measured
+- ✅ Next cycle started
+
+**But Phase 8 never truly ends - Kaizen is continuous!**
+
+---
+
+## Next Steps
+
+**You have two paths:**
+
+### Path A: Continue Kaizen Cycle
+
+```
+[M] Return to Activity Menu — start next cycle with [A] Analyze Product
+    Start next improvement cycle
+```
+
+### Path B: New Product Feature
+
+```
+[N] Return to Phase 4-5 (UX Design & Design System)
+    Design new complete user flow
+    Then Phase 4 [H] Handover (Design Deliveries)
+```
+
+---
+
+## When to Pause Kaizen
+
+**Kaizen never stops, but you might pause for:**
+
+- Major strategic shift (new product direction, pivot)
+- Team capacity (overwhelmed, need to stabilize)
+- Measurement period (waiting for data)
+
+**But always return to Kaizen!**
+
+---
+
+## Success Metrics
+
+✅ Learnings reviewed
+✅ Next opportunity identified
+✅ Prioritization complete
+✅ Next cycle started
+✅ Cycle log updated
+
+---
+
+## Failure Modes
+
+❌ Not reviewing learnings
+❌ Not identifying next opportunity
+❌ Stopping after one cycle
+❌ Not prioritizing effectively
+❌ Scope creep (turning Kaizen into Kaikaku)
+
+---
+
+**Remember:** Great products aren't built in one big redesign. They're built through continuous, disciplined improvement. One cycle at a time. Forever. 改善