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-4-ux-design/data/modular-architecture/02-workflows/storyboards-guide.md

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+# Storyboard Integration
+
+**Using visual storyboards for complex components**
+
+---
+
+## Core Concepts (01-)
+
+### [What Are Storyboards?](01-what-are-storyboards.md)
+
+Visual documentation of state transitions and flows
+
+### [When to Use Storyboards](01-when-to-use.md)
+
+Complexity indicators that require visual documentation
+
+### [Storyboard Types](01-storyboard-types.md)
+
+State transitions, interaction flows, multi-component sync
+
+---
+
+## Storage & Organization (02-)
+
+### [File Structure](02-file-structure.md)
+
+Where to store storyboards in the three-tier architecture
+
+### [Naming Conventions](02-naming-conventions.md)
+
+How to name storyboard files
+
+---
+
+## Creation Guidelines
+
+### [How to Create Storyboards](creation-guide.md)
+
+Hand-drawn, digital, or annotated screenshots
+
+### [Annotation Best Practices](annotation-guide.md)
+
+Numbering, labels, and visual indicators
+
+---
+
+## Integration
+
+### [Referencing in Feature Files](feature-file-integration.md)
+
+How to link storyboards from specifications
+
+### [Referencing in Component Files](component-file-integration.md)
+
+Visual state references
+
+---
+
+## Examples
+
+### [TaskFlow Task States](examples/task-states.md)
+
+6-state walk booking storyboard
+
+### [Search Flow](examples/search-flow.md)
+
+Multi-step interaction storyboard
+
+---
+
+## Benefits
+
+### [Why Storyboards Work](benefits.md)
+
+Developer clarity, QA testing, design consistency