feat(cpn): reduce paste and drag'n'drop prompts

[elecpower]

Fixes #4920

Summary of changes:

• add option to apply action choice to all remaining models
• selecting cancel stops further processing

Summary by CodeRabbit

• New Features

  • Added "Apply to all remaining models" checkbox to paste operations, allowing a single conflict resolution decision to be applied to all remaining models being pasted.

• Bug Fixes

  • Fixed cancel handling to properly stop paste processing.
  • Improved cleanup of moved/cut models during paste operations.

[coderabbitai]

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📝 Walkthrough

Walkthrough

MdiChild::pasteModelData adds state variables to track conflict-resolution choices, replaces repeated per-model prompts with a single dialog offering "Apply to all remaining models," and refactors cancel to exit the loop. Post-paste cleanup of moved models from the cut list is repositioned to coordinate with index recording.

Changes

Conflict resolution and cleanup in multi-model paste

Layer / File(s)	Summary
Conflict resolution state, dialog logic, and post-paste cleanup companion/src/mdichild.cpp	State flags track whether the user chose overwrite, insert, or apply-to-all. The "Model already exists" dialog now includes a checkbox to apply the decision to all remaining conflicting models and is shown only until that option is enabled. Cancel exits the paste loop instead of continuing. Post-paste cleanup removes moved models from the cut list at the point where moved indices are recorded.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch elecpower/cpn-enh-model-paste

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