Exclude viewport zoom from influencing the Transform node set by the drawing tools

[Keavon]

No description provided.

[gemini-code-assist]

Code Review

This pull request refactors shape and drawing tools (such as Arc, Circle, Ellipse, Grid, Polygon, Rectangle, Spiral, Star, Freehand, Pen, Spline, and Text) to use centralized transformation helper functions (viewport_zoom, window_aligned_transform, window_aligned_transform_set, and translation_transform_set) defined in resize.rs. This ensures consistent handling of viewport zoom, tilt, and flip across all tools. The review feedback focuses on optimizing these new helper functions and their usages by simplifying the underlying matrix mathematics, which avoids redundant matrix inversions, point transformations, and multiplications to improve performance and numerical stability.

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[cubic-dev-ai]

4 issues found across 14 files

Confidence score: 3/5

• In editor/src/messages/tool/tool_messages/spline_tool.rs (DragStop), translation is still computed in viewport space while PointerMove was switched to document-space, so ending a drag can apply a different delta and cause visible jump/drift at mouse-up—update DragStop to use the same document_to_viewport.inverse().transform_vector2(...) path before merging.
• In editor/src/messages/tool/common_functionality/resize.rs, there are a few algebraically redundant inverse/transform steps (duplicate .inverse(), inverse-then-multiply round-trip, and a simplifiable composed transform) that add avoidable matrix work and make the math harder to audit—fold these into the simplified forms and reuse cached inverses to reduce risk of future coordinate bugs.

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