feat(v2 docker widget): Fixes column-resize squashing (#6646)

* 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

---------

Co-authored-by: ajnart <thomas@ajnart.dev>

packages/widgets/src/common/use-persisted-table-layout.ts

@@ -107,7 +107,7 @@ export const parseColumnWidths = (value: string, columnAccessors: readonly strin
   }
 };
 
-export const usePersistedTableLayout = <T>({
+export const usePersistedTableLayout = <T,>({
   columns,
   columnAccessors,
   columnOrder,