Changes from background agent bc-b75ce0ba-ab73-494d-8f3d-d72d7a795931

[bahmanabbassi]

Update lineament vectorization to fit straight segments to skeleton paths, eliminating zigzag artifacts in exported shapefiles.

The previous raster-to-vector conversion using bwboundaries on thinned binary images resulted in pixel-level zigzag artifacts. This change introduces a new skeletonPathsToFittedLines helper function that:

1. Skeletonizes and cleans the binary lineament map.
2. Breaks the skeleton at branchpoints to isolate individual paths.
3. For each path, it performs a PCA-based line fit to determine straight endpoints.
4. These straight segments are then mapped to world coordinates and stored in the Shape structures.
   This ensures that the Shape, Shape_Deep, and Shape_Shallow outputs represent lineaments as geometrically straight lines.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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