chore: sync upstream main

[tarik02]

What Changed

• Merged 40 upstream commits through pingdotgg/t3code@8c85b4933.
• Preserved the fork's Goal surface, default-mode user-input requests, conditional browser instructions, and provider launch environment handling.
• Kept AUR packaging and install instructions excluded because the fork does not publish those packages.

Why

Brings the fork up to date with upstream after #137 while retaining fork-specific behavior.

UI Changes

This imports upstream web, desktop, and mobile UI changes. Screenshots were not captured because browser verification was not requested.

Verification

• lowio corepack pnpm exec vp run --filter t3 --filter @t3tools/web --filter @t3tools/desktop --concurrency-limit 2 typecheck
• corepack pnpm exec vp lint --report-unused-disable-directives apps/server/src/provider/CodexDeveloperInstructions.ts apps/web/src/components/RightPanelTabs.tsx
• lowio corepack pnpm exec vp test run apps/web/src/components/RightPanelTabs.test.tsx (15 tests)
• Confirmed the merge parents are current org/main and exact upstream/main

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Made with GPT-5 using the Codex harness in T3 Code.

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[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	11.8 KiB	11.8 KiB	−10 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.6 KiB	5.6 KiB	+6 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.2 KiB	6.2 KiB	−16 B (−0.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	52.4 KiB	52.3 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	11.8 KiB	11.7 KiB	−41 B (−0.3%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.6 KiB	5.6 KiB	+3 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.2 KiB	6.2 KiB	−44 B (−0.7%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	53.2 KiB	53.2 KiB	−44 B (−0.1%)	66.4 KiB	✅
Claude	Live turn messages	10	9	−1 (−10.0%)	21	✅

Baseline: 71a62d8 · PR result: 8cd70de · 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: 81.5 KiB
• Claude decoded thread snapshot: 81.9 KiB

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