fix(web): restore sidebar thread list and row actions for NVDA

[gabrielelpidio]

#13491 regressed the sidebar for NVDA users, as reported by @akj in #13491 (comment):

1. The thread <ul> was set to role="presentation", so NVDA no longer announces "list with N items" and its L/I quick-nav keys skip the threads.
2. Each row (role="button") gained an aria-label. NVDA's browse mode reads that label in place of the row's contents, which hides the nested Snooze and Settle buttons.

This restores role="list" and drops the row aria-labels, so each row's name comes from its contents again. The screen-reader-only title that already leads each row keeps the title first. aria-current and the non-focusable scroll viewport (viewportTabIndex={-1}) from #13491 stay. Search results keep their label, since those listbox options have no nested actions. The now-unused resolveSidebarRowAccessibility helper and its tests are removed.

The change is @akj's, from their branch fix/sidebar-nvda-row-actions, and they are credited as co-author.

Verification

Checked Chrome's accessibility tree against a dev server with real data:

	main	This PR
Thread <ul>	role="presentation"	list with a listitem per row
Row name	"Fix Large Chat Thread Crash, t3chat-new" (label only)	"Fix Large Chat Thread Crash t3chat-new 9d Snooze thread Settle thread …"
Snooze / Settle	present in the tree, but hidden behind the label in NVDA browse mode	exposed buttons, part of the row's name

No visual change: before and after screenshots of the sidebar are identical. Sidebar logic tests, web typecheck and lint pass.

Not yet tested with real NVDA or VoiceOver. #13491 changed the list role to avoid a VoiceOver interaction boundary. @akj suspects the focusable scroll viewport caused that boundary, and #13491 already fixed the viewport. VoiceOver still needs checking. If the list still traps VoiceOver, we can revert just the list role and keep the label removal.

🤖 Generated with Claude Code (Claude Opus 5.5)

Summary by CodeRabbit

• Accessibility
  • Sidebar items now expose active-page status directly to assistive technologies.
  • Unsent drafts are identified in screen-reader text, and search results include the project name when available.
  • Thread titles provide accessible text, and thread items are presented as a list.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	+16 B (+0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	+2 B (+0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.4 KiB	6.4 KiB	+14 B (+0.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.2 KiB	56.2 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	9	9	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.5 KiB	−11 B (−0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	−3 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.4 KiB	−8 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.0 KiB	57.0 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: ab09917 · PR result: 6d397f7 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This is a focused accessibility regression fix that restores list navigation and exposes nested sidebar actions to screen readers. Changing the production list semantics may affect VoiceOver navigation, and the documented verification does not rule out that cross-screen-reader side effect.

^{You can add or adjust custom eligibility rules. Learn more.}

[gabrielelpidio]

Closing for now while we verify the NVDA behavior firsthand. The branch is kept so this can be reopened.