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/content-styles/comic-book.md

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+# Comic Book
+
+## Overview
+Bold outlines, halftone dots, speech bubbles, and dynamic action-style compositions.
+
+## Rendering Characteristics
+
+| Property | Value |
+|----------|-------|
+| **Detail level** | Medium — simplified but expressive |
+| **Lighting** | High contrast, dramatic shadows |
+| **Texture** | Halftone dots, Ben-Day dots, ink splatter |
+| **Color** | Bold, saturated, limited palette |
+| **Depth** | Flat with dramatic perspective |
+
+## Prompt Keywords
+`comic book, comic style, halftone, bold outlines, pop art, graphic novel, ink, dynamic, action`
+
+## Best For
+- Gaming, entertainment, youth brands, marketing campaigns
+- Storytelling sequences, feature explanations, onboarding
+
+## Dimensions Guide
+- Panels: various ratios, comic grid layout
+- Characters: variable, action poses