Rework client UI state: move and update showLogin/showApp in public/app.js to explicitly set display styles when toggling screens and ensure user info and file load on app show. Remove the theme toggle from public/index.html and simplify CSS by collapsing color variable definitions (dark-theme-focused) in public/style.css. Add a VS Code workspace file. Remove the old uploads/Think app (Dockerfile, package.json, server.js and associated lockfile).
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