UI-A6 — Motion measurement, perf-baseline, and release docs

[ZhuchkaTriplesix]

Epic: #170
Depends on: #173, #171, #172, #174, #175 (UI-A1–A5)

Source: docs/motion-and-high-refresh.md §6

Goal

Close the 0.4.4 milestone with measured results, updated docs, and release checklist items.

Files

• docs/motion-and-high-refresh.md — fill per-OS Hz verification table with real numbers
• docs/perf-baseline.md — add motion/high-Hz DevTools checklist
• docs/release-checklist.md — manual QA for animations and 120 Hz
• docs/planned-0.4.4.md — mark shipped, link closed issues
• CHANGELOG.md — draft 0.4.4 section (or prep PR)

Implementation

• DevTools checklist: frame build+raster under budget at 60/90/120/144 Hz (8.3 ms @120, 6.9 ms @144).
• Per-OS table: Linux (compositor), Windows (DWM), macOS (ProMotion) — before/after Hz from refresh_rate or DevTools.
• Manual QA: dialog open, tree expand, dropdown, tab switch at 120 Hz — no jank.
• Reduced-motion QA: OS setting + app toggle.
• Update epic Epic — Release 0.4.4 UI motion polish and high refresh rate (UI-A1–UI-A6) #170 release criteria checkboxes.

Acceptance Criteria

• docs/motion-and-high-refresh.md has measured Hz table (not TBD).
• perf-baseline.md includes motion section.
• release-checklist.md has 0.4.4 animation QA items.
• All UI-A1–A5 PRs merged; epic ready to close.

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