- Corrected blank line insertion logic to preserve tight packing for sibling declarations when editing packed containers.
- Extracted visible_child_chunks() and sibling_gap_has_blank_line() helpers to unify child filtering and gap detection logic.
- Updated VARIABLE_TRAITS to mark variables as packed and addressable_leaf for consistent spacing behavior.
- Changed Key chunk kind to use PACKED_LEAF_TRAITS for proper tight packing alignment.
- Added regression tests for TOML table and TypeScript variable packing after insertions.
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