Fix width calculation in table-edit-form to use offsetWidth

[Copilot]

Addresses feedback from #19429 on jQuery removal: parseInt(td.style.width) fails when width is not set via inline styles, returning NaN.

Changes

• Replace parseInt(td.style.width) with td.offsetWidth in table-edit-form.ts
  • offsetWidth returns computed width as number (matches original jQuery .css('width') behavior)
  • Works regardless of whether width is set via inline styles, CSS classes, or computed layout

// Before (broken)
let width = parseInt(td.style.width);  // NaN if no inline style

// After (fixed)
let width = td.offsetWidth;  // Actual rendered width

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