Fix the Pen tool's preview being misplaced and angle-locked after undo or redo

[Keavon]

• Undo/redo: no longer leaves the locked angle snapped angle active while Ctrl and/or Shift are pressed
• Undo: no longer leaves the preview segment at a random place until the cursor is moved to update it

[gemini-code-assist]

Code Review

This pull request introduces suppression of the angle-lock (Ctrl) and angle-snap (Shift) modifier keys when they are held down during undo/redo operations in the Pen tool. It adds suppress_lock_angle and suppress_snap_angle states to PenToolData, along with helper methods read_modifiers and refresh_preview_after_history to handle the post-history state and defer preview re-rendering until after the graph has re-evaluated. There are no review comments, so I have no feedback to provide.

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[cubic-dev-ai]

1 issue found across 1 file

Confidence score: 3/5

• There is a concrete state-management risk in editor/src/messages/tool/tool_messages/pen_tool.rs: refresh_preview_after_history can leave angle_locked stale after undo/redo, which may cause incorrect angle-lock behavior when Ctrl is pressed again.
• Given the issue is moderately severe (5/10) with solid confidence (7/10) and affects user-visible tool interaction, this carries some regression risk rather than being purely cosmetic.
• Scope appears limited to one file and one behavior path, so the change may still be manageable to merge once this reset path is verified.
• Pay close attention to editor/src/messages/tool/tool_messages/pen_tool.rs - ensure angle_locked is reinitialized correctly during history refresh and subsequent modifier-key flows.

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Re-trigger cubic</sub>