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-6-asset-generation/data/styles/design-styles/editorial.md

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+# Editorial
+
+## Overview
+Magazine-inspired design with strong typography hierarchy, editorial layouts, and storytelling focus.
+
+## Visual Characteristics
+
+| Property | Value |
+|----------|-------|
+| **Whitespace** | Strategic — frames content like a magazine spread |
+| **Color palette** | Restrained — often monochrome with one accent |
+| **Typography** | Strong hierarchy, serif headlines, elegant spacing |
+| **Borders** | Thin rules, column dividers |
+| **Shadows** | Minimal |
+| **Imagery** | Full-bleed photography, editorial style |
+| **Icons** | Minimal use — typography carries the design |
+
+## Prompt Keywords
+`editorial, magazine, typographic, sophisticated, storytelling, grid-based, print-inspired, refined`
+
+## Best For
+- Media, publications, blogs, luxury brands, cultural institutions
+- Content-heavy sites where reading experience matters
+
+## Avoid
+- SaaS dashboards, e-commerce with many products, data-heavy apps