Make virtual fit placeholder be manual virtual fitting

[ebrahimebrahim]

The transducer tracking algorithm will ultimately use the transducer transforms generated by the virtual fitting procedure as an initialization for the registration between the transducer-registration-surface and then photoscan.

For now in this issue we'll introduce a temporary solution to get things working right away in a manual way:
When the virtual fit button is clicked, interaction handles are enabled for the transducer transform. When the virtual fit is clicked again, the interaction handles are disabled. This is "manual" virtual fitting.

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Traceability Information:

• Issue: SlicerOpenLIFU#153
• SOFTREQ: SlicerOpenLIFU#32
• Comment: This issue is related to the requirements defined in SlicerOpenLIFU#32.

This information was populated automatically by a script on 2025-06-09T18:04:10Z.