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

_bmad/bmm/config.yaml

@@ -0,0 +1,16 @@
+# BMM Module Configuration
+# Generated by BMAD installer
+# Version: 6.6.0
+# Date: 2026-05-14T18:41:47.586Z
+
+user_skill_level: intermediate
+planning_artifacts: "{project-root}/_bmad-output/planning-artifacts"
+implementation_artifacts: "{project-root}/_bmad-output/implementation-artifacts"
+project_knowledge: "{project-root}/docs"
+
+# Core Configuration Values
+user_name: Devparsa
+project_name: Momento
+communication_language: French
+document_output_language: English
+output_folder: "{project-root}/_bmad-output"