Install the browser mermaid-cli actually launches

Install the browser mermaid-cli actually launches The launcher asks for chrome-headless-shell; the workflow installed chrome, so the render step failed on a missing build while reporting a cache path that looked correct. Install both, and reproduce the condition locally against an isolated cache rather than a warm one. Co-Authored-By: Claude Opus 5 (1M context) Claude-Session: https://claude.ai/code/session_01XmzqahsmAXBn5wJab92jP2