fix(web): respect panel motion and nested timeline scrolling

[rynfar]

When a tool result has its own scroll area, wheel and navigation keys could also move the outer timeline or collapse the composer. The timeline now responds only when that nested area can hand scrolling to its parent. Composer and draft-hero transitions also use Pylon's existing panel-motion setting, including reduced-motion and disabled states.

This adapts selected T3 Code changes from da6a85b1365993d0ff2a79698cd82498de247d8a, 7c2702d68ae2e10fa9d3a08c996ed47c393dcffd, and 68607c5a99147710b92228e0642f6c0a642e32a6 while preserving Pylon context controls. Keyboard worktree submit and Escape suggestions were already adopted in prior Pylon PRs and are outside this diff.

Validation: 166 focused tests passed; vp run -F web typecheck passed; changed-file lint exited 0 with existing warnings; git diff --check passed. Independent review found no blocking issue. Browser interaction verification remains pending because this task has no browser-use approval.

Implemented by GPT-6 Sol (low reasoning) in the Codex harness, with root-agent oversight and independent GPT-6 Sol review.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated
pylon-marketing	Ignored	Preview	Sep 24, 2026 8:02am UTC

[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	14.0 KiB	13.9 KiB	−79 B (−0.6%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+14 B (+0.2%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−93 B (−1.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−88 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	8	−2 (−20.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	−10 B (−0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−15 B (−0.2%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+5 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	−44 B (−0.1%)	66.4 KiB	✅
Claude	Live turn messages	10	9	−1 (−10.0%)	21	✅

Baseline: 7ed3f71 · PR result: deb6ad8 · 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: 115.7 KiB
• Claude decoded thread snapshot: 116.3 KiB

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