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/modular-architecture/02-workflows/01-when-to-use.md

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+# When to Use Storyboards
+
+**Complexity indicators that require visual documentation**
+
+---
+
+## Create Storyboards For:
+
+✅ **Components with 3+ states**
+
+- Example (TaskFlow): Task status (TODO, IN_PROGRESS, BLOCKED, DONE, ARCHIVED)
+
+✅ **Time-based transitions**
+
+- Example (TaskFlow): Deadline reminders, auto-status updates
+
+✅ **Multi-step user flows**
+
+- Example (TaskFlow): Creating → Assigning → Completing a task
+
+✅ **Complex interactions between components**
+
+- Example (TaskFlow): Task completion updates dashboard and team notifications
+
+✅ **State machines with branching paths**
+
+- Example (TaskFlow): Happy path vs validation error vs timeout
+
+---
+
+## Don't Need Storyboards For:
+
+❌ **Simple buttons**
+
+- Hover and active states are obvious
+
+❌ **Static content sections**
+
+- No state changes to document
+
+❌ **Single-state components**
+
+- Nothing to show in sequence
+
+---
+
+## Examples
+
+### Need Storyboard:
+
+- **TaskFlow:** Task status board (5 states, time-based reminders)
+- **Future Project:** Search with autocomplete (5 states, real-time)
+- **Future Project:** Multi-step form (progress tracking)
+- **Future Project:** Payment flow (multiple steps, error handling)
+
+### Don't Need Storyboard:
+
+- Submit button (2-3 states)
+- Hero image (static)
+- Text paragraph (no states)
+- Logo (no interaction)
+
+---
+
+## Next Steps
+
+- [Storyboard Types](01-storyboard-types.md)
+- [Creation Guide](creation-guide.md)