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/workflow-conceptualize.md

@@ -0,0 +1,39 @@
+---
+name: 'workflow-discuss'
+description: 'Creative dialog for page design — discuss what each page needs, then visualize and specify.'
+---
+
+# [C] Discuss — Creative Dialog for Page Design
+
+**Goal:** Lead a focused creative dialog for each page — what does it need, can we simplify it, then visualize and specify.
+
+**When to use:** The default design activity. Start here for any page that needs design thinking before building.
+
+---
+
+## INITIALIZATION
+
+Read design log at `{output_folder}/_progress/00-design-log.md` before starting.
+
+## Entry
+
+Load scenario context (Trigger Map, scenario overview) from `{output_folder}/C-UX-Scenarios/`.
+
+## Steps
+
+Execute steps in `./steps-c/`:
+
+| Step | File | Purpose |
+|------|------|---------|
+| 01 | step-01-exploration.md | Open-ended design exploration |
+
+**Reference data:**
+- `./data/guides/DESIGN-LOOP-GUIDE.md` — the 8-step design loop (discuss → wireframe → iterate → spec sync → implement → refine)
+- `./data/scenario-init/` — scenario initialization guides
+- `./data/page-creation-flows/` — page creation flow options
+
+---
+
+## AFTER COMPLETION
+
+Step 01's two-option transitions handle all navigation. The design log is updated at every transition within the step itself. There is no separate "after completion" — the step loops through pages until the user stops or all pages are designed.