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-1-project-brief/workflow-validate.md

@@ -0,0 +1,51 @@
+---
+name: 'workflow-validate'
+description: 'Verify all Product Brief artifacts are complete, consistent, and ready for Phase 2.'
+---
+
+# Phase 1 Validation: Product Brief
+
+**Goal:** Verify all Product Brief artifacts are complete, consistent, and ready for Phase 2.
+
+---
+
+## INITIALIZATION
+
+### Design Log
+
+Read `{output_folder}/_progress/00-design-log.md` before starting.
+
+### Configuration Loading
+
+1. Load project config from `{project-root}/_bmad/wds/config.yaml`
+2. Locate Product Brief at `{output_folder}/A-Product-Brief/`
+3. Begin validation: Load and execute `./steps-v/step-01-brief-completeness.md`
+
+---
+
+## Validation Sequence
+
+Execute each step in order. Each step produces a section of the final validation report.
+
+| Step | Name | Validates |
+|------|------|-----------|
+| 01 | Brief Completeness | All required sections present and filled |
+| 02 | Trigger Map Consistency | Goals → personas → forces chain is valid |
+| 03 | SEO Strategy | Keyword map complete, page assignments clear |
+| 04 | Content & Language | Tone, personality, guidelines coherent |
+| 05 | Visual Direction | Brand, style, references documented |
+| 06 | Platform Requirements | Tech stack, integrations specified |
+
+---
+
+## Final Output
+
+Save validation report to `{output_folder}/A-Product-Brief/validation-report.md`
+
+---
+
+## AFTER COMPLETION
+
+1. Update design log
+2. Suggest next action
+3. Return to activity menu