feat(communication): validate duplicate IPs in ConnectedAP within the same SubNetwork

[lorenzhoerburgerbearingpointcom]

This PR adds IP validation to the ConnectedAP edit wizard (Communication Plugin).

What changed

• Added duplicate-IP validation for the IP field against other ConnectedAP entries in the same SubNetwork.
• Added support in wizard-textfield for a custom reserved-value validation message.
• Wired ConnectedAP IP validation to show a clearer error message when the IP is already used.
• Added unit tests for duplicate-IP validation.

Example SCD snippet (duplicate IP in same SubNetwork):

<SubNetwork name="StationBus" type="8-MMS">
  <ConnectedAP iedName="IED1" apName="P1">
    <Address>
      <P type="IP">192.168.210.111</P>
      <P type="IP-SUBNET">255.255.255.0</P>
      <P type="IP-GATEWAY">192.168.210.1</P>
      ...
    </Address>
  </ConnectedAP>

  <ConnectedAP iedName="IED2" apName="P1">
    <Address>
      <P type="IP">192.168.210.111</P>
      <P type="IP-SUBNET">255.255.255.0</P>
      <P type="IP-GATEWAY">192.168.210.1</P>
      ...
    </Address>
  </ConnectedAP>
</SubNetwork>

Context

This PR was first created in in com-pas/compas-open-scd. It was already reviewed and the feedback is implemented in this PR.

[github-actions]

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2026-07-06 06:53 UTC

[noraeb]

@lorenzhoerburgerbearingpointcom Looks good to me, do you have the rights to merge the PR?

[lorenzhoerburgerbearingpointcom]

Hi @noraeb thanks for the review. No I don't have the permissions to merge.