Add comprehensive mobile-first responsive styles across billing, code-editor, file-upload, and main style sheets. Introduce a dedicated mobile.css file (702 lines) with hamburger navigation, sidebar overlay, pull-to-refresh indicator, and touch-friendly sizing. Integrate GestureHandler and PullToRefreshIndicator classes into file-list, file-preview, and file-upload-view components for swipe-to-close and pull-to-refresh interactions. Remove legacy inline media queries from style.css and link mobile.css in index.html.
Replace all eight footer legal links from .md to .html extensions in mywebdav-app.js and create corresponding HTML documents for privacy policy, data processing agreement, terms of service, cookie policy, security policy, compliance statement, data portability & deletion policy, and contact & complaint mechanism, each with placeholder content and back navigation.
Replace every occurrence of "RBox" with "MyWebdav" in source files, configuration,
legal documents, UI components, and test fixtures. This includes renaming the
`RBoxApp` class to `MyWebdavApp` in the JavaScript component, updating the
TOTP issuer from "RBox" to "MyWebdav" in the auth router, changing the
application description in the argument parser, and updating all user-facing
strings in HTML templates, legal policies, and the manifest file. The
`.env.example` default for `TOTP_ISSUER` is also updated accordingly.
