Deep-wiki: mermaid diagrams prevent interaction with modal controls

I'm no frontend dev but I see z-index:9999 on the .diagram-zoom-overlay but not on the .diagram-zoom-controls: https://github.com/microsoft/skills/blob/5a6104bd49d8fd4e733a30952953fd1cf9f16e62/.github/plugins/deep-wiki/commands/build.md?plain=1#L513-L522 https://github.com/microsoft/skills/blob/5a6104bd49d8fd4e733a30952953fd1cf9f16e62/.github/plugins/deep-wiki/commands/build.md?plain=1#L533-L539

In practice, the SVG of the diagram is above the controls, so if you drag the diagram up (or zoom in) it will cover the controls

Copying the z-index directive to the controls seems to fix this but I am unsure if that is the best approach