Add WebDAV URL visibility in user profile

[Copilot]

Users couldn't find their WebDAV server URL despite WebDAV being fully implemented. Added discovery path through profile UI.

Changes

Profile page (static/profile.html)

• Added WebDAV Connection section displaying dynamically generated server URL
• Clipboard copy button using Navigator Clipboard API
• Link to platform-specific setup guide

Setup guide (static/webdav-setup.html)

• Platform-specific connection instructions (Windows, macOS, Linux, iOS, Android)
• Troubleshooting for common issues (Registry edits, file size limits, auth configuration)

Documentation (README.md)

• Moved WebDAV from roadmap to current features

Security & Accessibility

• XSS prevention: DOM methods (createElement, textContent) instead of innerHTML for user-controlled content
• Link security: rel="noopener noreferrer" on external links
• Semantic HTML: Proper <kbd> tag usage for keyboard shortcuts
• ARIA labels for screen reader support

Screenshots

Profile page WebDAV section:

Setup guide:

Original prompt

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This section details on the original issue you should resolve

<issue_title>Webdav address</issue_title>
<issue_description>Where can I find my webdav address?</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Webdav address #114

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