Fix strokes with inside/outside alignment not being selectable when above other layers

[Keavon]

Fixes #4206

[gemini-code-assist]

Code Review

This pull request updates the click target calculation in extend_targets_from_vector to double the stroke width for inside/outside-aligned strokes on closed paths. The reviewer suggested optimizing this logic by combining the subpath collection, closed-path check, and closure modification into a single pass over the iterator to avoid multiple iterations over the allocated vector.

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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