UI: indigo/slate theme, border cleanup, rounder edges
theme.css:
- Dark mode palette shifted from navy to dark slate with indigo warmth
(#111113 / #18181f / #1e1e27). Primary restored to true indigo
(#818cf8) instead of the blue (#5b9cf6) it had drifted to.
- Borders reduced to near-invisible rgba(99,102,241,0.10) indigo tint.
- --radius-md 8px→12px, --radius-lg 12px→18px.
- Tag/wikilink/status-in-progress colors unified to indigo family.
- Thin indigo-tinted scrollbars (4px, rgba thumb).
ChatMessage.vue:
- Message bubbles 16px→18px radius.
- User bubble: flat primary → indigo gradient (#6366f1→#4f46e5).
- Assistant bubble: border removed, relies on bg-card vs bg contrast.
ChatView.vue:
- Sidebar border-right, chat-header border-bottom, context-sidebar
border-left all removed.
- Streaming bubble: border removed, radius 16px→18px.
- Active conv item: solid primary fill → 15% opacity indigo tint with
primary-colored text (softer, more refined selection state).
- Send button: flat primary → indigo gradient + glow on hover.
- New Chat button: glow on hover.
- Queued bubble: matches send button gradient.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
