th-d5b446: conversation sidebar + resume + new-chat (daemon PWA)

[brentrager]

Problem

The Big Smooth daemon PWA (smooth-web SPA) was a single, ephemeral chat: useOperator created one fresh session per page load with a random agentId and had no history or conversation list. There was no way to see past conversations or resume one.

Solution

A toggleable slide-in conversation sidebar + resume + new-chat, built against the sibling server agent's WS contract (pearl th-d5b446).

operator.ts — three more smooth-operator WS actions

• list_conversations — sent on connect and after every completed turn (eventual_response); the reply's data.conversations populates a new conversations: ConversationSummary[]. Exposed with refreshConversations().
• resumeConversation(conversationId) — clears the transcript, opens a create_conversation_session bound to that conversationId, and (once the session id comes back) chases it with get_conversation_messages to load history into messages. A pendingResumeRef sequences the history fetch after the session reply, since it needs the sessionId.
• newConversation() — fresh create_conversation_session (no id), cleared transcript, activeConversationId reset.
• immediate_response now branches on payload shape (conversations[] → list, messages[] → history, sessionId → bind session + capture conversationId for highlighting).

App.tsx — the sidebar

• Aurora-Glass Sidebar: overlays with a backdrop on mobile, docks on desktop (lg:pl-72 on the main column), highlights the active conversation, lists title + relative time + message count, and carries a prominent New chat button.
• A menu-toggle button (top-left, above the drawer). The Smooth brand mark moved into the sidebar header.
• Empty-state greeting preserved for a fresh/new chat.

Back-compat

No sidebar interaction ⇒ identical single-chat behaviour to before.

Assumptions to reconcile with the server agent

• History message shape assumed { role, content } (defensive on text/message aliases). User turns render inbound, everything else assistant; past tool chips are NOT reconstructed — history is text-only.
• ConversationSummary.updatedAt read defensively (ISO string or epoch; a bare number < 1e12 treated as seconds) in relTime.
• get_conversation_messages is sent with both sessionId and conversationId (contract left it ambiguous).

Build status

• pnpm build:web — clean ✅
• tsc --noEmit — clean ✅ (also fixed two pre-existing ChatMessage literals missing the required blocks field, which only survived via vite's esbuild)
• Not E2E-tested — the list_conversations / get_conversation_messages / resume server actions integrate when the Rust side lands (the daemon path-deps the server).

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Latest commit: 9e0d264

The changes in this PR will be included in the next version bump.

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@smooai/smooth	Minor

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