Enable rendering of Mermaid diagrams embedded in markdown on the launchpad page. Adds CSS (.mermaid-diagram-wrapper and svg rules) to ensure responsive, centered diagrams and updates the markdown loader to find code.language-mermaid blocks, render them via mermaid.render, and replace the code block with a styled wrapper. Includes error handling that logs rendering errors and shows a user-facing error box. Changes are localized to internal/launchpad/index.html.
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