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

.agents/skills/wds-1-project-brief/templates/project-brief-dialog/07-positioning.md

@@ -0,0 +1,86 @@
+# Step 7: Positioning
+
+**Completed:** {{date}}
+**Session:** {{session_number}}
+
+---
+
+## Positioning Exploration
+
+**Agent asked:**
+{{opening_question_about_positioning}}
+
+**User's initial response:**
+{{first_response}}
+
+---
+
+## Key Exchanges
+
+### Differentiation
+
+**Agent:** {{question_about_difference}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_unique_angle}}
+
+---
+
+### Market Context
+
+**Agent:** {{question_about_alternatives}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_competitive_landscape}}
+
+---
+
+### Value Proposition
+
+**Agent:** {{question_about_value}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_core_value}}
+
+---
+
+## Reflection Checkpoint
+
+**Agent's synthesis:**
+{{positioning_understanding}}
+
+**User response:**
+- [ ] Confirmed
+- [ ] Corrected
+
+**Corrections (if any):**
+{{corrections}}
+
+---
+
+## Positioning Statement
+
+{{positioning_statement}}
+
+**For:** {{target_user}}
+**Who:** {{their_situation}}
+**This product:** {{what_it_is}}
+**That:** {{key_benefit}}
+**Unlike:** {{alternatives}}
+**Our approach:** {{differentiation}}
+
+---
+
+## Supporting Evidence
+
+**Why this position makes sense:**
+1. {{rationale_1}}
+2. {{rationale_2}}
+3. {{rationale_3}}
+
+---
+
+**Documented in:** `wds-project-outline.yaml` → `positioning`