- Change Cmd+[/] from workspace history navigation to browser back/forward
(only when focused surface is a browser, no-op on terminal)
- Add WKUIDelegate with createWebViewWith to handle target=_blank links
- Add decidePolicyFor check for targetFrame==nil and cmd+click modifier
to open links in new browser surface in the same pane
- Override willOpenMenu in CmuxWebView to rename "Open Link in New Window"
to "Open Link in New Tab"
- Add E2E test for browser back/forward via socket and Cmd+[/] shortcuts
