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-4-ux-design/templates/instructions/form-validation.instructions.md

@@ -0,0 +1,54 @@
+# Form Validation
+
+**Include when:** Page has forms or input fields
+
+---
+
+## Validation Rules
+
+| Field | Rule | Error Code | Error Message |
+|-------|------|------------|---------------|
+| `{field-name}` | {validation-rule} | `{ERR_CODE}` | {message} |
+
+---
+
+## Error Messages
+
+| Error Code | Trigger | EN | SE | Recovery |
+|------------|---------|-----|-----|----------|
+| `ERR_001` | {When occurs} | "{English}" | "{Swedish}" | {How to fix} |
+
+---
+
+## Form States
+
+### Valid State
+- All fields pass validation
+- Submit button enabled
+- No error indicators
+
+### Invalid State
+- Error fields highlighted
+- Error messages visible
+- Submit button disabled until fixed
+
+### Submitting State
+- Submit button shows loading
+- Fields disabled
+- Cancel option available
+
+---
+
+## Field Specifications
+
+### {Field Name}
+
+| Property | Value |
+|----------|-------|
+| **OBJECT ID** | `{form-field-id}` |
+| Type | {text / email / password / select / etc.} |
+| Required | {yes / no} |
+| Placeholder EN | "{Placeholder text}" |
+| Placeholder SE | "{Swedish placeholder}" |
+| Validation | {rules} |
+| Error Message | {message} |