IgniteUI / igniteui-angular / 42006118432

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fix(grid): update the borders styles to be more consistent (#17909)

* fix(grid): align selection, group-by and pinned borders with the light theme

- Selection cells in body rows use the action border color.
- The group-by row and header indentation take the pinned border when no
  pinned start column follows them, and the regular column/header border
  (including hover and selected colors) when one does.
- Filtering cells of pinned columns keep the pinned border.
- Remove a demo override in the percentage widths sample that cleared the
  cell borders through an undefined CSS variable.

Closes #17506

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(grid): shorten border comments

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(grid): use the BEM mixins for the indentation borders, update changelog

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(grid): keep the :has() indentation rules out of the cell selector lists

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(grid): drop the redundant body row selector border rule

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(grid): use the header border width and style after the last row action cell

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(grid): match the summaries patch border to the group-by indentation

The summaries patch takes the pinned border width when no pinned start
column follows it, like the group-by indentation. Since the indentation
width now depends on the pinned start columns, the cached feature columns
width is measured again after render when they appear or disappear.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(grid): use the pinned summaries patch border only under the group-by indentation

Without grouping the patch sits under the row action cells and keeps their
header border width. The feature columns width check now tracks the pinned
start state on ... (continued)

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