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/03-users.md

@@ -0,0 +1,82 @@
+# Step 3: User Definition
+
+**Completed:** {{date}}
+**Session:** {{session_number}}
+
+---
+
+## Opening Question
+
+**Agent asked:**
+{{opening_question_about_users}}
+
+**User's initial response:**
+{{first_response}}
+
+---
+
+## User Exploration
+
+### Primary User Discovery
+
+**Key exchanges:**
+
+**Agent:** {{followup_question}}
+**User:** {{response}}
+
+**Agent:** {{deeper_question}}
+**User:** {{response}}
+
+**Agent:** {{clarifying_question}}
+**User:** {{response}}
+
+---
+
+## Reflection Checkpoint
+
+**Agent's synthesis:**
+{{understanding_of_primary_user}}
+
+**User response:**
+- [ ] Confirmed
+- [ ] Corrected
+
+**Corrections (if any):**
+{{corrections}}
+
+---
+
+## Primary User Definition
+
+**Who they are:**
+{{user_description}}
+
+**Their context:**
+{{situation_and_environment}}
+
+**Their frustrations:**
+{{pain_points}}
+
+**What they're trying to achieve:**
+{{goals_and_jobs_to_be_done}}
+
+**How they currently solve this:**
+{{current_alternatives}}
+
+---
+
+## Secondary Users (if applicable)
+
+**User 2:** {{description_or_none}}
+**User 3:** {{description_or_none}}
+
+---
+
+## User Scenarios Captured
+
+**Scenario 1:** {{concrete_example}}
+**Scenario 2:** {{concrete_example}}
+
+---
+
+**Documented in:** `wds-project-outline.yaml` → `users`