feat(dia.Element): add getPortBBox(), getPortCenter(); port metrics c…

[kumilingus]

• feat(dia.Element): Add getPortBBox() and getPortCenter() methods
  Introduced methods to retrieve the bounding box and center of a specific port. Includes caching to avoid redundant port layout calculations on repeated calls.

• perf(dia.Element): Optimize hasPort() and hasPorts() methods
  Improved performance by leveraging internal data structures for constant-time (O(1)) lookups, replacing the previous linear-time (O(n)) approach.

• feat(connectionPoints): Add useModelGeometry option to bbox and rectangle connection points
  Enables calculation of connection points using only the model geometry—ideal for scenarios requiring DOM-independent rendering or performance-sensitive environments.

• feat(examples): add connection-points-ts example showcasing various connection points scenarios

[Copilot]

Pull Request Overview

This PR introduces new port metric methods for dia.Element, adds caching for port layout calculations, and improves connection points performance by leveraging model geometry. It also updates test cases and examples to reflect these new capabilities.

• Added getPortCenter() and getPortBBox() methods to retrieve port center and bounding box.
• Replaced linear port lookups with constant-time operations and introduced caching.
• Extended connection point functions with a useModelGeometry option for DOM‐independent rendering.

Reviewed Changes

Copilot reviewed 12 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/joint-core/test/jointjs/elementPorts.js	Added tests for getPortCenter() and getPortBBox() methods
packages/joint-core/test/jointjs/connectionPoints.js	Extended tests with useModelGeometry option for connection points
packages/joint-core/src/dia/ports.mjs	Updated caching and port metrics calculations
packages/joint-core/src/dia/Element.mjs	Refactored port center logic to use getPortCenter()
packages/joint-core/src/connectionPoints/index.mjs	Modified connection point logic to consider model geometry
packages/joint-core/src/anchors/index.mjs	Adjusted rotation handling in anchor calculations
examples/connection-points-ts/*	Updated configuration and examples to showcase new connection point APIs

Files not reviewed (3)

• examples/connection-points-ts/.gitignore: Language not supported
• examples/connection-points-ts/package.json: Language not supported
• examples/connection-points-ts/tsconfig.json: Language not supported