* fix(dataTable): resizing a column no longer squashes the others
mantine-datatable's built-in column resize keeps the table's total
width fixed by shrinking every other column to compensate, which
collapses columns toward zero in a narrow widget (open upstream
issue, no fix: icflorescu/mantine-datatable#discussions-757).
Replaced it with our own resize handle that only ever changes the
width of the column being dragged - the table grows and scrolls
horizontally instead. Shared via usePersistedTableLayout, so docker,
downloads, and beszel-system-table all get it.
* feat(docker): enable hold-Shift advanced focus preview
The widget already renders differently for displayMode="advanced",
but was missing supportsAdvancedFocus: true, so the board never
offered the hold-Shift preview for it - matching downloads and
media-server, which both set this flag.
* style(docker): tighten row density, decouple icon size from row height
Circular avatar, denser row/footer padding, and action icons rendered
larger than their button via absolute positioning so they don't
inflate row height (the button stays small and fixed - it repeats
once per row, so any growth there multiplies across every visible
container).
* fix(data-table): harden shared column resizing
* fix(data-table): account for board scaling
* fix(data-table): compact shared headers
* fix(data-table): fit columns to widget
* fix(downloads): simplify advanced details
* test(widgets): align Docker advanced focus
* fix(downloads): widen expanded details
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Co-authored-by: ajnart <thomas@ajnart.dev>