Terminal File Browser

Added a files tab to the project detail view that reads any public GitHub repo using the GitHub Contents API — no auth token required. Features a collapsible directory tree on the left and a syntax-highlighted code viewer on the right with line numbers, copy, and download buttons. Supports JSX, JS, TS, CSS, JSON, HTML, and Markdown. Matches the terminal aesthetic — IBM Plex Mono, green on black, thin dark scrollbars.