feat: dG and cG with single-step undo#13
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Adds
dGandcG(delete/change from cursor to buffer end). UseseditBuffer.deleteRange()instead of the higher-level selection + backspace approach, which lets the host editor treat it as one operation.The host's undo system splits multi-line deletions into per-line entries, so
uafterdGwould only restore one line at a time. Fixed by saving a pre-operation snapshot and restoring from it on undo. The snapshot is invalidated when any other buffer-modifying action runs. This also fixes undo fordeandcewhich had the same pattern.