fix(graph): 支持关闭网格自动吸附

[ytzry]

What is changed

• Add snapToGrid support to grid options.
• Allow grid rendering config and snap behavior config to be controlled independently.
• Make graph coordinate snapping, node dragging, DnD drop, and transform resize respect the snap config.
• Keep compatibility with existing minimal grid config such as { size: 10 }.
• Add regression tests for config behavior and runtime interaction paths.

Tests

• pnpm exec vitest run __tests__\graph\graph.spec.ts __tests__\graph\coord.spec.ts __tests__\view\node\index.spec.ts __tests__\plugin\dnd.spec.ts __tests__\plugin\transform.spec.ts
• pnpm exec tsc --noEmit

[gemini-code-assist]

Code Review

This pull request introduces support for disabling automatic grid snapping via a new grid.snapToGrid option, updating the coordinate manager, drag-and-drop plugin, transform plugin, and node view to respect this setting. However, a bug was identified in the drag-and-drop plugin (src/plugin/dnd/index.ts) where the logic for shouldSnapToGrid incorrectly snaps the node to the grid when this.snapOffset is truthy, which would override and break snapline alignment. A correction has been suggested to ensure grid snapping is only applied when this.snapOffset is falsy.

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