feat(mobile): add iPad keyboard command palette

[rynfar]

On iPad, Pylon lacked a hardware-keyboard command palette and visible-thread shortcuts. Add a native palette for existing Pylon actions, Cmd-K and Cmd-1–9 ownership for the visible list, and an iOS Return-key preference backed by the native composer. The implementation keeps both Pylon thread lists, current routes and editor behavior, and guards late modal focus when closing.

Adapted upstream sources 26b8f985d85773e41a2ee637785f7c87d5c1a01e (#11679) and e33b710d5f1147993e52076a9e033d97ef4106ad (palette colors). Upstream hover/gesture-handler patches, legacy-list retirement, app-link schemes, and broad lockfile churn are excluded. Android can reach the keyboard settings route through a deep link, but it does not show the iOS-only Return controls. No Oh My Pi integration is included.

Validation: 98 focused mobile tests, mobile typecheck, scoped lint/format/diff checks, and an unsigned iPad simulator build with the pinned Xcode tooling. Independent review passed on exact head 03ff2a68be27152c1a5d2a627c4a3966c382d466. Browser/device interaction and before/after captures were not performed; the native compile is not runtime acceptance.

Implemented by GPT-6 Sol through the Codex harness.

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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	14.0 KiB	13.9 KiB	−33 B (−0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.2 KiB	7.2 KiB	+2 B (+0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.8 KiB	6.7 KiB	−35 B (−0.5%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	58.0 KiB	58.0 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	14.0 KiB	14.0 KiB	+15 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.2 KiB	7.2 KiB	−11 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.8 KiB	+26 B (+0.4%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.9 KiB	58.9 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: 7ed3f71 · PR result: 03ff2a6 · 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.