feat(console/ai): group conversations list by date (Today / Yesterday / …)

[xuyushun441-sys]

Why

The conversations list was a flat, undated stream. ChatGPT/Claude group it by recency, which makes a long history scannable.

What

Group conversations into sections — Today, Yesterday, Previous 7 days, Previous 30 days, Older — with section headers, newest-first within each, empty sections omitted. Boundaries are calendar-day based (local midnight), so Today/Yesterday track the real day rather than a rolling 24h.

Bucketing is a pure exported groupConversationsByDate(conversations, nowMs?) (nowMs defaults to now, kept out of the render path). Search, active highlight, rename/delete, and the per-row relative time are unchanged.

Verification

• 506/506 tests (4 new on the bucketing: ordered sections, empty omitted, newest-first within a section + unparseable timestamp sorts oldest, createdAt fallback). TZ-robust offsets so the midnight boundary can't flake.
• tsc clean; no new lint errors.

Fourth of the chat-UX pass (after #1703 collapse, #1705 resize, #1707 shortcuts). Next: message/input-area polish.

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
objectui	Ignored		Jun 13, 2026 2:49pm

[github-actions]

✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	115.5 KB	350 KB
Entry file	index-BHKtEfKK.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
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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
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permissions (usePermissions.js)	1.42KB	0.68KB
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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