feat(views): pearl-set-grouping command

Phase 3 of the interactive-grouping spec: the command that ties phases 1 and 2 together. pearl-set-grouping completing-reads a dimension (status/project/assignee/priority/none), coerces and validates it, regroups the buffer, then persists the choice on the source. M-x only for now, like pearl-set-sort. The transient and keymap entries come later.

pearl--apply-grouping is the non-interactive core, shaped like pearl--apply-sort. On a successful regroup it re-folds the page and writes :client-group into the header. On an empty buffer it reports no-issues and writes nothing, so a failed grouping never advertises a layout the buffer doesn't show. none ungroups and clears the override. 4 tests cover persistence, the none-clears path, the re-fold, and the no-issues skip.

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