The pop-up in the Element Data panel has black text and the checkboxes are not properly aligned.

[MaartenVisser-nl]

The pop-up in the Element Data panel has black text and the checkboxes are not properly aligned.

Component: top-data-table-panel built-in — the configuration pop-up for "Columns"
(opened from the Element Data panel). Environment

• @thatopen/ui: 3.4.9
• @thatopen/services: 0.3.11
• @thatopen-platform/components-beta: 3.5.8
• @thatopen-platform/components-front-beta: 3.5.11
• @thatopen-platform/fragments-beta: 3.5.7
• thatopen CLI: 0.3.6 (beta version, thatopen serve)
• Theme: dark
• Operating System: Windows 11 · Browser: Brave

Steps to reproduce

1. Open the app and load a model (e.g., an IFC with IFCSLAB elements).
2. Open the Element Data panel (data table).
3. Click the "Columns" button to open the column configuration pop-up window.

Actual result

• The popover table rows and the Σ — aggregation dropdowns behind them show through and overlap the popover text
• There is no visible border/raising separating the popover from the panel.
• The popover header ("Columns ×") overlaps the header of the panel / the "N elements" row.
• The checkboxes are not consistently aligned within a column and the first (group) checkbox floats relative to the label; the vertical rhythm between the label rows is inconsistent.
• Unchecked checkboxes have very low contrast in the dark theme.

Expected result

• The header does not overlap the panel/table header.
• Checkboxes and their labels are on a consistent grid; sufficient contrast for the unchecked status in both light and dark themes. Notes
• The purple accent on checked items is as expected — set on the app side via --bim-ui_accent-base: #6528d7. This report concerns the popover surface/layout, which is independent of the accent override.
• Reproduced with the default generated app (thatopen create --beta), only extended
  by adding the potree-core dependency to fix a bundling error.