fix: keep full-width resizable example sizes in sync with layout

[minwookshin]

Fixes #5870 in the v8 React example.

Size the table from getTotalSize() with a full-width minimum and define leaf widths in a colgroup. Fixed layout keeps grouped headers and body cells aligned while the existing wrapper handles horizontal scrolling.

Checked repeated grow/shrink drags, group resizing, alignment and scroll containment at 390, 900 and 1440px in Chromium, Firefox and WebKit (nine cases). The regression fails on the original example. Example build and formatting passed. TypeScript reports the same existing unused parameter in makeData.ts:39 on both revisions; it passes with that unused-parameter check disabled.

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