Stereo Import menu: hide registration section, align Warp to All, interactive-stereo warp

[mattdawkins]

Two related Import-menu changes for stereo datasets:

1. Hide the Import Registration section on stereo datasets

Per-camera registration transform import is meant for (non-stereo) multicam rigs; stereo rigs use the calibration (camera file) import instead. registrationSupported now also requires the dataset subtype not be stereo.

2. "Warp to All" alignment + interactive-stereo behavior

• The "Warp to All" checkbox now lines up with the "Overwrite" checkbox instead of sitting partially below it.
• On stereo datasets the option now operates through the interactive stereo service: when interactive stereo is enabled and a camera calibration is present, checking it warps every imported detection from the active camera to the other camera — head/tail lines transfer as lines (also computing the stereo measurement), polygons as polygons, plain boxes as boxes — skipping any frame the other camera already has, then saving. The per-annotation transfer machinery is reused with the auto-compute preference bypassed (the user asked for the warp explicitly).
• When interactive stereo is off or no calibration is loaded, the checkbox is greyed out with a hint explaining what's missing.
• Multi-camera (non-stereo) datasets keep the existing registration-based warp, gated on rig registration as before.

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