fix(web): sidebar session reveal + stop doubled streaming text

[cnjack]

Summary

• Sidebar: after the first user message, optimistically insert the session into the left list with a real title (backend only indexes on first RecordUser); empty Welcome sessions stay out of the list; never show a raw UUID as the title; light enter animation for new rows.
• Streaming: fix WSClient.disconnect() so intentional close does not schedule auto-reconnect. React StrictMode remount left a ghost WebSocket that also received agent_text, doubling every delta (你好你好 / HiHi / How How).
• Refresh tasks/sessions on agent_done so title / running / updated_at stay in sync.

Test plan

• Open Welcome / New chat — no phantom UUID row in the sidebar
• Send first message — session appears immediately with message-based title and enter animation
• Streaming assistant reply is not doubled (especially in make run / Vite dev with StrictMode)
• After a turn finishes, sidebar title and running state match the server
• Hard refresh still lists prior sessions correctly

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6875d13b-87bb-40fa-af1d-46ca1eec4b2e

📥 Commits

Reviewing files that changed from the base of the PR and between 09517d3 and 5813ffe.

📒 Files selected for processing (10)

• web/src/app/store.ts
• web/src/app/wsBridge.ts
• web/src/components/CommandPalette.tsx
• web/src/components/Sidebar.tsx
• web/src/i18n/locales/en.ts
• web/src/i18n/locales/ja.ts
• web/src/i18n/locales/ko.ts
• web/src/i18n/locales/zh-Hans.ts
• web/src/i18n/locales/zh-Hant.ts
• web/src/lib/ws.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/web-sidebar-session-and-ws-double-stream

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