Keep table widths synchronized during and after window resize

[YishenTu]

Rendered tables could retain an old width during window resizing because AppKit's nested event-tracking loop did not reliably service deferred restyles. This change completes table reflow synchronously during live resize by default and lets embedders defer that work until release with rendersTablesDuringLiveResize = false.

With deferred rendering enabled, table images stay unchanged during the drag and reflow when resize ends, without a debounce delay. A final width delivered later by SwiftUI hosting still updates synchronously when it arrives.

Implementation

• Track live-resize state at the scroll-view boundary and complete table raster, attribute, height, and overlay updates together.
• Preserve per-run-loop coalescing for ordinary width changes. Deferred mode also holds callbacks queued before a live resize began.
• Keep post-resize synchronization armed while clip, document, and text-view widths show an unconsumed hosting-layout mismatch.
• Preserve exact fractional geometry, text insets, fixed reading-column ownership, document height, and wide-table overlay sizing.
• Limit width-change restyling to indexed table paragraphs.

Validation

• swift test --arch arm64: 492 tests passed across 68 suites, including 22 table-width tests.
• Native AppKit/TextKit coverage includes intermediate and final widths, late hosting layout, fractional widths, multiple tables, height changes, and wide overlays.
• New regressions verify unchanged table images throughout deferred dragging, synchronous final reflow, queued callbacks, and preserved source and selection.
• DarthScriptum integration: 22 focused resize and compatibility tests passed with the published engine revision; manual shrink/widen checks passed on the installed app.

Trade-off

The default behavior synchronously renders tables during each physical resize callback. Embedders that prioritize drag responsiveness can disable live table rendering; table images then retain their previous geometry until release. Both modes preserve immediate final-width synchronization.