Redesign UI: Midnight Indigo workspace with sidebar & saved chat history

[droidbg]

Summary

A full UI overhaul into a premium "Midnight Indigo" workspace — dark-first with a polished light variant — plus real, persistent multi-conversation
support. All existing chat/API/key/retry logic is preserved.

Workspace shell

• Left sidebar: "New chat", scrollable chat history (active highlight, hover rename/delete), bottom profile row with an editable local display name +
  Settings shortcut. Fixed on desktop, slide-in drawer on mobile.
• Center workspace: Fraunces serif welcome headline, 2×2 suggestion grid, floating composer with shortcut hint + character count.

Functional chat history

• New useConversations hook backed by a pure useReducer with localStorage persistence — chats survive reload, auto-title from first message,
  replies route to the correct conversation even when switching mid-request.

Design system

• Slate/graphite surfaces, single electric-indigo accent, ~14px radii, gradient buttons, soft elevation, dark + light themes, reduced-motion support,
  and a CSS-only glass-marble orb.

Verification

tsc ✓ · ESLint ✓ · vite build ✓

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Project	Deployment	Actions	Updated (UTC)
echoai-backend	Ready	Preview, Comment	Jun 19, 2026 11:39am
echoai-ui	Ready	Preview, Comment	Jun 19, 2026 11:39am