Add table range selection feature

[paustint]

Introduce a shift-click range selection capability for table rows, allowing users to select multiple rows at once. This feature includes the necessary state management and updates to the row selection logic. The implementation ensures that the last toggled row serves as an anchor for the selection range.

[Copilot]

Pull request overview

This PR adds Shift-click range selection for data-table row checkboxes by introducing a shared “anchor row” (last non-shift toggle) and a helper that applies selection across the visible row model range.

Changes:

• Added a selectRowRange() helper to apply selection/unselection across a contiguous visible row range.
• Introduced a shared row-selection “anchor” via GridRuntimeContext, backed by a stable ref in GridContainer.
• Updated checkbox selection handling and keyboard navigation to avoid conflicting Shift behaviors in the select column.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
libs/ui/src/lib/data-table/grid/renderers/CellRenderers.tsx	Implements Shift-click range selection behavior in the select-row checkbox renderer.
libs/ui/src/lib/data-table/grid/keyboard/useGridKeyboardNavigation.ts	Prevents Shift-click in the select column from extending rectangular cell selection.
libs/ui/src/lib/data-table/grid/grid-row-utils.ts	Adds selectRowRange() utility to update selection across a row id range.
libs/ui/src/lib/data-table/grid/grid-context.tsx	Extends grid runtime context with optional row-selection anchor getter/setter.
libs/ui/src/lib/data-table/grid/components/GridContainer.tsx	Stores the selection anchor in a ref and exposes stable getter/setter via runtime context.
libs/ui/src/lib/data-table/grid/tests/grid-row-utils.spec.ts	Adds unit tests covering selectRowRange() behavior (forward/backward, grouped rows, non-selectable rows, missing ids).