Undo/redo: no onEditCommit round-trip, and stack granularity is per-keystroke

[zvndev]

Problem (two related issues)

1. undo()/redo() (with enableUndoRedo) only call the internal setPendingValue(oldValue) and emit undo/redo events — they never fire onEditCommit. For external-state grids a revert never reaches the data source, and cells rendering from row.original don't even show it.
2. The undo stack pushes one action per setPendingValue call, and CellInput calls that on every keystroke — so undoing a typed edit walks back character by character instead of one action per committed edit.

Expected

One user edit = one undo step, and undo/redo re-emit through onEditCommit (with the old value) so external stores stay in sync.

Impact

Any store-backed grid can't ship undo/redo at all — the buttons would visually do nothing or half-work.

Versions: yable-react 0.10.4 / yable-core 0.9.0.