fix: stabilize window focus and tiled frames

[qeude]

Summary

• Keep tiled layouts and scroll offsets aligned with sizes accepted by applications.
• Improve parking verification, animation fallback, and border tracking after native frame changes.
• Trace hotkey sources and preserve focus behavior around transient windows.

Testing

• Not run (change request content only).

Note

Stabilize window focus, tiled frame acceptance, and border parking verification

• Pointer focus is now denied when a selected non-modal transient window sits outside the target's ancestry, matching the existing cross-application modal block (FocusSelection.swift)
• Tiled windows record the frame a native app accepts versus the requested layout frame. Layout, column widths, and scrolling now use accepted sizes, and reconciliation preserves accepted sizes unless the window is fullscreen, externally changed, or the discovered frame no longer matches (Layout.swift, RuntimeState.swift)
• Parking verification schedules now carry an expected point and 1.4s deadline, and stale or duplicate verification callbacks are ignored. A parking repair is only recorded after a successful post-write readback (AXFrameCoordinatorSettlement.swift)
• Border geometry is now timestamp-ordered: delayed observations and size writes without a verified readback can no longer replace newer committed geometry. Animation capability decisions use up to 16 recent latency samples per process instead of only the smoothed prediction, and animated frames fall back to an instant commit when a process cannot support intermediate frames
• Safe-corner parking retains each window's original vertical position instead of defaulting to the bottom of the parking frame (Parking.swift)
• Risk: columnLayoutWidth and focusedColumnLeftScrollOffset/focusedColumnTargetScrollOffset in WorkspaceScrolling.swift changed signatures and gained accepted-size-aware widths; column widths and scroll offsets can shrink or expand when windows accept sizes different from the preferred layout

^{Macroscope summarized a0561b5.}

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This is a broad runtime behavior change across tiling, focus, scrolling, border presentation, and asynchronous Accessibility writes, with new state and coordination logic rather than a small isolated fix. The parking verification retry path also has an unresolved medium-severity concern about continuing beyond its intended deadline.

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[cubic-dev-ai]

All reported issues were addressed across 23 files

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[cubic-dev-ai]

All reported issues were addressed across 7 files (changes from recent commits).

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