Let users resize and reorder table columns by dragging

[priethor]

Goal

On the table layout, you should be able to drag a column edge to resize it or drag a column header to reorder columns. The saved view has a layout slot but no fields for column widths or order, so any interactive change today is gone on reload.

Scope

• Drag a column edge to resize it. Keep min and max widths sane so cells and controls don't get squished or stretched into oblivion.
• Drag a column header to move it within the active view.
• Save column widths and order onto the active view's layout so they stick across reloads.
• The title column stays visible; this flow doesn't hide it.

Out of scope

• Resize and reorder on layouts other than table.
• Frozen or pinned columns.

Acceptance criteria

• Resize a column, reload, and the width sticks.
• Reorder columns, reload, and the order sticks.
• The title column stays visible no matter what.
• Columns can't shrink below a sensible minimum.