- VPS URL: now an input field in Side Panel, no longer hardcoded
- Dynamic script injection via chrome.scripting.executeScript
- host_permissions changed to <all_urls> for flexibility
- 163 Mail: new content script (mail-163.js) with actual selectors
- Mail items: div[sign="letter"], sender: .nui-user, subject: span.da0
- Supports aria-label fallback for matching
- Mail provider selector: dropdown to switch between QQ Mail and 163 Mail
- Background routes steps 4/7 to correct mail content script
- Settings persist in chrome.storage.session
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