feat(console/ai): collapsible conversations list (auto-tucks when preview opens)

[xuyushun441-sys]

Why

The desktop AI chat pins an 18rem conversations list at all times. When the Live Canvas preview opens, the layout becomes list + chat (42%) + preview — the chat column gets cramped (the exact complaint: "右侧展开预览之后，屏幕空间就特别窄"). Make the list collapsible to reclaim that space.

What

• Manual: a desktop header toggle (PanelLeftClose / PanelLeftOpen) collapses/expands the list; the preference persists (localStorage).
• Auto: opening the preview auto-tucks the list and restores it on close — but only if the auto-collapse is what hid it. A manual toggle, or a list the user already collapsed, is never overridden; auto-collapse is transient (not persisted). The rule is "never fight the user."

The collapse logic is extracted into an exported useCollapsibleChatsList hook (testable in isolation). ChatPane reports the preview opening/closing up via a new onCanvasOpenChange callback.

Verification

• 477/477 tests (5 new on the hook): default expanded + persisted toggle, init-from-storage, auto-tuck + restore on preview close, respect a manual collapse (no spurious re-expand), and a manual toggle during preview taking control (no auto-restore after).
• tsc clean; new code lint-clean.

Mobile is unchanged (it already uses a Sheet drawer). First step in a broader chat-UX pass.

Note: logic is unit-tested; I haven't yet captured a live-rig screenshot of the collapse animation (needs a console rebuild into the EE rig) — can do on request.

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
objectui	Ignored		Jun 13, 2026 2:26pm

[github-actions]

✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	114.1 KB	350 KB
Entry file	index-92Ca1vCg.js	—
Status	PASS	—

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📦 Bundle Size Report

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auth (ForgotPasswordForm.js)	4.79KB	1.88KB
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Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped