Implement pasting nodes at cursor position in graph

[kevlu93]

Closes #3798

This PR implements cursor-based paste by calculating the offset of the first selected node to be copied from the location of the most recent click. The following changes were added:

1. The copied nodes are sorted by new id, so that we know the selection order of the nodes.
2. Calculate the difference between the mouse position (ipp.mouse.position) and the location of the first selected node.
3. Add the nodes to the graph (NodeGraphMessage::AddNodes), and then shift by the offset (NodeGraphMessage::ShiftSelectedNodesByAmount)

One thing I'm not sure about is that one needs to actually click the desired paste location in order for ipp.mouse.position to update. Is there another something else tracking the cursor location?

Here's two examples of copy and paste

First we select the Transform node at (-15,3) as well as the Path node.

Next, I click (-16,4) based on eyeballing the grid, then paste the nodes with Ctrl+v. The Transform node is pasted to (-16,4), while the pasted Path node maintains the relative distance to the Transform node, without any wires to the Transform node.

Next, I select Stroke -> Transform -> Path and then copy the nodes. Stroke is at (-22, 3).

Finally, I click at (-16, 8) then paste with Ctrl+v. We paste Stroke node at (-16, 8), and the other selected nodes are copied as well with wires maintained.

[gemini-code-assist]

Code Review

This pull request implements pasting nodes at the cursor's position in the node graph by calculating the offset between the cursor and the first absolutely positioned node, then shifting the pasted nodes accordingly. The feedback suggests avoiding the hardcoded grid size of 24. in favor of using the GRID_SIZE constant, and simplifying the reference handling of IVec2 by copying the option value.

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[cubic-dev-ai]

1 issue found across 2 files

Confidence score: 5/5

• In editor/src/messages/portfolio/document/node_graph/node_graph_message_handler.rs, hardcoding 24. instead of GRID_SIZE can cause subtle grid alignment inconsistencies later if the shared constant changes, increasing maintenance risk rather than immediate runtime risk — replace the literal with GRID_SIZE as f64 before merging to keep behavior centralized.

<sub>Reply with feedback, questions, or to request a fix.

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

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

_{Re-trigger cubic}

[timon-schelling]

!build (Run ID 28262192850)

[github-actions]

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