- Add _showDestructiveConfirm() helper: shows modal with 5-second
auto-confirm countdown bar; user can confirm early or cancel
- throwAll(): now shows confirmation before discarding all stock
- submitUseAll(): same confirmation before marking all as used
- undoTransactionEntry(): replace native confirm() with modal
- Rename core logic to _doSubmitUseAll() / _doUndoTransaction()
- btn-log-undo: more visible (red tint + larger font) so user can
easily undo accidental operations from the history log
- Bump app.js version to v=20260505a
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