fix(FXC-4341): Fix scene::plot_structures_porperty for doping

[marc-flex]

Fix scene::plot_structures_porperty with property=doping when the doping is defined with SpatialDataArrays that don't have overlapping coordinates

Greptile Summary

This PR fixes a bug in the plot_structures_property method where plotting doping with SpatialDataArrays that have non-overlapping coordinates would fail. The fix adds bounds_error=False and fill_value=0 to the interpolation kwargs, allowing out-of-bounds points to be handled gracefully by setting them to 0 instead of raising an error. This change follows the existing interpolation pattern used elsewhere in the codebase (monitor_data.py).

Confidence Score: 5/5

• This PR is safe to merge with no concerns - it's a minimal, targeted fix that addresses the previous review comment correctly.
• The fix is minimal and focused: adding bounds_error=False and fill_value=0 to interpolation kwargs. This directly addresses the issue where scipy's RegularGridInterpolator would fail on out-of-bounds points. The implementation matches established patterns elsewhere in the codebase (monitor_data.py). The change is well-tested by existing test cases (test_plot_property) which specifically test plotting with SpatialDataArray doping. No new logic branches or complex code paths are introduced.
• No files require special attention

Important Files Changed

Filename	Overview
tidy3d/components/scene.py	Fixes interpolation issue in plot_structures_property by adding bounds_error=False and fill_value=0 to kwargs when interpolating doping data with non-overlapping coordinates. This prevents scipy's RegularGridInterpolator from raising errors for out-of-bounds points.

Sequence Diagram

sequenceDiagram
    participant User
    participant plot_structures_property
    participant interp_method
    participant RegularGridInterpolator
    
    User->>plot_structures_property: Call with SpatialDataArray doping
    plot_structures_property->>plot_structures_property: Create 100x100 grid for plotting
    plot_structures_property->>interp_method: interp(**struct_coords, method="nearest", kwargs={...})
    Note over interp_method: Before fix: bounds_error=True (default)<br/>Grid points may fall outside data bounds
    interp_method->>RegularGridInterpolator: Create interpolator (bounds_error=True)
    RegularGridInterpolator-->>interp_method: ValueError if out-of-bounds!
    
    Note over plot_structures_property: After fix: bounds_error=False
    interp_method->>RegularGridInterpolator: Create interpolator (bounds_error=False, fill_value=0)
    RegularGridInterpolator->>RegularGridInterpolator: Out-of-bounds points → fill_value=0
    RegularGridInterpolator-->>interp_method: Interpolated data with zeros for out-of-bounds
    interp_method-->>plot_structures_property: Successfully interpolated data
    plot_structures_property-->>User: Plot rendered successfully

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Pull request overview

This PR fixes a bug in scene::plot_structures_property when plotting doping properties where doping is defined with SpatialDataArrays that have non-overlapping coordinates. The fix adds a fill_value=0 parameter to the interpolation call to handle coordinates outside the data range.

Key Changes

• Added kwargs={"fill_value": 0} to the interp() method call for SpatialDataArray doping data interpolation

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