Adds drag-to-resize and drag-to-reorder column UX to AuditResultsGrid,
with chosen widths + column order persisted in browser sessionStorage.
- wwwroot/js/audit-grid.js: dependency-free helper — pointer-driven
resize handles, native HTML5 drag-and-drop reorder, and a
sessionStorage save/load wrapper (mirrors treeview-storage.js).
- AuditResultsGrid: renders a resize handle per <th>, makes headers
draggable, applies persisted widths via a --audit-col-width custom
property, and wires reorder into the existing ColumnOrder /
OrderedColumns() mechanism. JS-invokable OnColumnResized /
OnColumnReordered persist + re-render. A stored order naming an
unknown column degrades gracefully (drops unknown keys, appends
missing columns in default order); widths clamp to a 64px minimum.
- AuditResultsGrid.razor.css: subtle scoped styling for the resize
handle affordance and the reorder drop-target highlight.
- App.razor references audit-grid.js alongside the other scripts.
- Tests: 6 new bUnit tests for the load/apply/persist logic and
graceful degradation; a new AuditGridColumnTests Playwright suite
for the drag UX + reload persistence. Audit page bUnit tests set
loose JSInterop mode since the grid now calls into audit-grid.js.
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