[renningg]

Summary

Add Fit selection to the workflow graph context menu. Right-click an unselected node to frame that node. Right-click a selected node or the selection outline to frame the selected group.

QA Instructions

• Open a workflow with several nodes. Select two, right-click one or the outline, and choose Fit selection. Repeat on an unselected node. Use the toolbar's Fit view to frame the full graph.
• Verified in Chromium with a 100-node mock workflow. All 46 tests across the editor, context menu, toolbar, and selection request suites passed.
• pnpm check:release passed formatting, lint, and types. The unit stage hit the same two macOS shortcut assertions on this branch and the clean base. The remaining release stages did not run.

Review

Offscreen nodes that have not been measured use the editor's existing size estimate. The action respects reduced motion and preserves the selection.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Meaningful regression coverage added / updated where needed; obsolete tests/code removed
• Persisted-state and API changes include required migrations / compatibility validation
• Relevant performance/efficiency opportunities considered; material claims have evidence
• Material review findings resolved and relevant checks rerun
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

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[joshistoast]

Assuming tests and checks pass, this looks good.