Add new commands for enhanced data entry and category management.
AddRecordRow: Adds a new record row in records mode with empty value.
TogglePruneEmpty: Toggles pruning of empty rows/columns in pivot mode.
ToggleRecordsMode: Switches between records and pivot layout.
DeleteCategoryAtCursor: Removes a category and all its cells.
ToggleCatExpand: Expands/collapses a category in the tree.
FilterToItem: Filters to show only items matching cursor position.
Model gains remove_category() and remove_item() to delete categories
and items along with all referencing cells and formulas.
Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)
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