chore(data-modeling): memoize functions passed to diagramming

[Anemy]

This is a good practice in general to help reduce unnecessary re-rendering.
It's also mentioned in react flow's docs: https://reactflow.dev/learn/advanced-use/performance#memoize-functions

We already do this in the diagramming package: https://github.com/mongodb-js/diagramming/blob/e5edc84fcc4fb6c960333c690cf0e291cd75c6c3/src/components/canvas/canvas.tsx#L146

[Copilot]

Pull Request Overview

Memoizes diagram interaction handlers to reduce unnecessary re-renders per React Flow performance guidance. Extracts static zoom config and replaces inline anonymous callbacks with stable useCallback references.

• Introduces memoized callbacks for node, edge, field, pane, connect, and drag events
• Extracts fitViewOptions into a top-level constant (ZOOM_OPTIONS)
• Refactors inline handlers in JSX to referenced callbacks

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