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-0-alignment-signoff/data/06-build-signoff-internal-routing.md

@@ -0,0 +1,28 @@
+---
+name: build-signoff-internal
+description: Build internal signoff document for company projects
+web_bundle: true
+---
+
+# Phase 6: Build Internal Signoff
+
+**Goal:** Build an internal signoff document for projects that don't need an external contract.
+
+**Your Role:** Guide the user through creating a signoff document that captures goals, budget, ownership, and approval.
+
+---
+
+## Steps
+
+| # | File | Purpose |
+|---|------|---------|
+| 01 | [Build Internal Signoff](01-build-internal-signoff.md) | Build the internal signoff document |
+| 02 | [Finalize Signoff](02-finalize-signoff.md) | Finalize and present signoff document |
+
+**Template:** `../../wds-1-project-brief/templates/signoff.template.md`
+
+---
+
+## INITIALIZATION
+
+Load and execute `01-build-internal-signoff.md` to begin.