feat(console/ai): draggable chat ↔ preview split (ChatGPT/Claude-style)

[xuyushun441-sys]

Why

When the Live Canvas preview opens, the chat column was a fixed 42% — no way to rebalance. Continuing the "preview makes it cramped" thread (#1703), add a draggable divider between chat and preview, like ChatGPT's canvas / Claude's artifacts.

What

• Drag the divider to resize; the width persists (localStorage).
• Clamped both ways so neither pane collapses: chat ≥ 360px, and never so wide the preview drops below 420px. A ResizeObserver re-clamps when the window shrinks or the chats list collapses.
• Double-click to reset; ←/→ resize by 24px when the divider is focused (role="separator", keyboard-accessible).
• A transparent overlay during the drag keeps pointer events flowing past the canvas iframe (which would otherwise swallow them mid-drag).

Clamp logic is a pure exported clampChatPaneWidth; the useResizableChatPane hook keeps all DOM reads in handlers/effects (none during render).

Verification

• 482/482 tests (5 new on the clamp: floor at min, cap so preview keeps room, in-range untouched, tiny-container floor wins, unmeasured container → floor only).
• tsc clean; no new lint errors.

Desktop-only divider (md:block), matching the desktop split. Pairs with the collapsible list (#1703) — together they make the preview workspace comfortable on any width.

Note: clamp + persistence are unit-tested; I haven't captured a live-rig screenshot of the drag (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 2:37pm

[github-actions]

✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	114.9 KB	350 KB
Entry file	index-B5IMd3dn.js	—
Status	PASS	—

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📦 Bundle Size Report

Package	Size	Gzipped
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app-shell (runtime-config.js)	4.40KB	1.57KB
app-shell (types.js)	0.01KB	0.04KB
auth (AuthContext.js)	0.31KB	0.24KB
auth (AuthGuard.js)	1.17KB	0.53KB
auth (AuthProvider.js)	17.16KB	3.44KB
auth (AuthShell.js)	3.49KB	1.40KB
auth (ForgotPasswordForm.js)	4.79KB	1.88KB
auth (LoginForm.js)	5.11KB	1.92KB
auth (PreviewBanner.js)	0.90KB	0.50KB
auth (RegisterForm.js)	6.63KB	2.15KB
auth (SocialSignInButtons.js)	8.89KB	3.61KB
auth (UserMenu.js)	3.40KB	1.22KB
auth (authStyles.js)	5.04KB	1.72KB
auth (createAuthClient.js)	24.74KB	6.00KB
auth (createAuthenticatedFetch.js)	3.33KB	1.32KB
auth (index.js)	1.75KB	0.76KB
auth (types.js)	0.59KB	0.35KB
auth (useAuth.js)	4.01KB	0.79KB
auth (useIsWorkspaceAdmin.js)	1.28KB	0.70KB
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collaboration (PresenceProvider.js)	2.42KB	0.96KB
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collaboration (useMentionNotifications.js)	1.81KB	0.68KB
collaboration (usePresence.js)	6.33KB	1.84KB
collaboration (useRealtimeSubscription.js)	7.91KB	2.01KB
components (index.js)	399.21KB	84.50KB
core (index.js)	1.45KB	0.54KB
create-plugin (index.js)	9.28KB	2.98KB
data-objectstack (index.js)	96.04KB	23.89KB
fields (index.js)	157.36KB	37.46KB
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i18n (useObjectLabel.js)	19.40KB	4.48KB
i18n (useSafeTranslation.js)	1.63KB	0.57KB
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mobile (ResponsiveContainer.js)	0.94KB	0.38KB
mobile (breakpoints.js)	1.51KB	0.70KB
mobile (createOfflineDataSource.js)	5.61KB	1.74KB
mobile (index.js)	1.50KB	0.62KB
mobile (offlineQueue.js)	3.91KB	1.35KB
mobile (pwa.js)	0.97KB	0.49KB
mobile (serviceWorker.js)	1.48KB	0.62KB
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permissions (usePermissions.js)	1.42KB	0.68KB
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plugin-report (index.js)	34.79KB	9.13KB
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plugin-view (index.js)	81.53KB	19.87KB
providers (DataSourceProvider.js)	0.75KB	0.39KB
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types (mobile.js)	0.20KB	0.18KB
types (navigation.js)	0.20KB	0.18KB
types (objectql.js)	0.20KB	0.18KB
types (overlay.js)	0.20KB	0.18KB
types (permissions.js)	0.20KB	0.18KB
types (plugin-scope.js)	0.20KB	0.18KB
types (record-components.js)	0.20KB	0.19KB
types (registry.js)	0.20KB	0.18KB
types (reports.js)	0.20KB	0.18KB
types (spec-report.js)	5.26KB	1.96KB
types (tenant.js)	0.20KB	0.18KB
types (theme.js)	0.20KB	0.18KB
types (ui-action.js)	0.75KB	0.46KB
types (views.js)	0.20KB	0.18KB
types (widget.js)	0.20KB	0.18KB

Size Limits

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