[Firewall] UI Issues

[PeterJhongLinksys]

Issues

1. IPv6 protocol unavailable

• Cannot select IPv6 protocol when creating/editing Firewall rules

2. Add button state error

• Add button remains in incorrect state after editing a rule

Add.button.state.error.after.edit.a.rule.mov

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Parent issue: #570

[AustinChangLinksys]

Resolution Update

Issue: 'Add' button remained disabled after dismissing the bottom sheet.
Root Cause: The 'Add' button state logic relied on explicit Cancel/Save callbacks, which were not triggered when dismissing the sheet via scrim tap or header close.
Resolution: Added .whenComplete(widget.onCancel) to CardRenderer.dart to ensure state reset on any dismissal.
Status: Fixed & Verified.

[AustinChangLinksys]

Firewall UI issues (Add Button state) resolved.
PR: #581
Commit: 4864d2da