[cyanzhong]

No description provided.

[Copilot]

🔵 Needs a closer look

The major renderer upgrade and higher Safari baseline need compatibility validation in MarkEdit’s supported WebKit hosts.

No open issues 🎉

What changed in this PR

Migrates MarkEdit-preview to Mermaid 12.2, updates its dependencies, and adds coverage for rendering defaults and build variants.

Changes:

• Upgrades Mermaid and its dependency tree, including ELK layout support.
• Raises the build target from Safari 16 to Safari 17.4.
• Adds renderer integration tests and strengthens theme initialization and bundle inclusion checks.

File	Description
yarn.lock	Locks Mermaid 12.2 and updated transitive dependencies.
vite.config.mts	Raises the Safari build target to 17.4.
tests/​render.styles.test.ts	Checks exported HTML theme initialization across color schemes.
tests/​mermaid.integration.test.ts	Adds real-renderer coverage for diagrams, themes, and legacy appearance options.
tests/​build.test.ts	Checks ELK inclusion in full builds and exclusion from lite builds.
package.json	Updates the Mermaid dependency to ^12.2.0.

_{Review effort: Balanced}