FE-504: Add copy/paste and select all to petrinaut editor

[kube]

🌟 What is the purpose of this PR?

Add clipboard support and selection shortcuts to the petrinaut editor, enabling users to copy, paste, and select all items in the SDCPN canvas.

🔗 Related links

• FE-504 (internal)

🔍 What does this change?

• Copy (Cmd/Ctrl+C): Serializes selected items (places, transitions, token types, differential equations, parameters) to clipboard as a versioned JSON format (petrinaut-sdcpn v1). Arcs between selected nodes are preserved within their transitions; arcs to unselected nodes are stripped.
• Paste (Cmd/Ctrl+V): Deserializes clipboard data, generates new UUIDs for all items, deduplicates names with numeric suffixes, remaps internal references (arc→place, place→colorId/differentialEquationId, equation→colorId), and offsets pasted nodes by 50px. Newly pasted items are automatically selected.
• Select All (Cmd/Ctrl+A): Selects all canvas nodes (places and transitions).
• Escape to deselect: Clears selection in addition to switching to cursor mode.
• Clipboard format: Versioned payload validated with zod, includes source document ID for future cross-document reconciliation.
• zod added as a dependency for clipboard payload validation.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• modifies an npm-publishable library and I have added a changeset file(s)

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

🐾 Next steps

• Cross-document paste with dependency reconciliation (copy from one document, paste into another — may need to bring referenced types/equations along)
• Cut (Cmd/Ctrl+X) support

🛡 What tests cover this?

• 77 unit tests across 3 test files:
  • deduplicate-name.test.ts — name suffix logic (12 tests)
  • serialize.test.ts — serialization, arc stripping, payload parsing with zod validation (32 tests)
  • paste.test.ts — ID generation, name deduplication, position offset, arc remapping, reference remapping, data preservation (33 tests)

❓ How to test this?

1. Checkout the branch
2. Open the petrinaut editor with a net containing places, transitions, types, equations, and parameters
3. Select items and press Cmd+C, then Cmd+V — confirm duplicates appear with new names and offset positions
4. Press Cmd+A — confirm all canvas nodes are selected
5. Press Escape — confirm selection is cleared
6. Copy items from one document and paste into another — confirm they paste as independent copies

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Project	Deployment	Actions	Updated (UTC)
petrinaut	Ready	Preview, Comment	Mar 12, 2026 1:32am

3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
hash	Ignored	Preview	Mar 12, 2026 1:32am
hashdotdesign	Ignored	Preview	Mar 12, 2026 1:32am
hashdotdesign-tokens	Ignored	Preview	Mar 12, 2026 1:32am

[kube]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• FE-504: Add copy/paste and select all to petrinaut editor #8533 👈 (View in Graphite)
• Show chevron on hover in VerticalSubViewsContainer Header #8532
• H-5655: Refactor selection logic and migrate to @xyflow/react v12 #8523 : 1 other dependent PR (#8528 )
• FE-225: Petrinaut: Setup rolldown-plugin-dts and update @typeScript/native-preview + vite #8509
• FE-225, H-6116, H-6286: Update Petrinaut UI #8472 : 1 other dependent PR (#8463 )
• H-5839, FE-488: Petrinaut: LSP-like interface for Diagnostics and Code Editor #8300
• FE-223, H-5780, H-6227: Setup Petrinaut inside HASH + Build with Vite 8 and TypeScript 7 #8369
• main

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