* fix(browser): focus unified tab on browser page palette activation
When activating a browser page from the palette, find and focus the
corresponding unified tab before setting active state. Ensures the
tab group receives focus. Also increase e2e test timeouts to improve
stability on slower runners.
* test(e2e): read latest restored terminal frame
* Fail browser page activation when unified tab is missing
Without a unified tab, the workspace can't render in the pane. Reporting
success leaves the previous tab on screen. Fail the activation to prevent
this confusing state.