fix(site): announce adapters when switching to a tab that is still loading

[leeguooooo]

A tab opened in the background can still read about:blank from page JS when the agent switches to it, so 1.5.159 recorded an empty host and never announced that site's adapters. The hint now uses the url the command reported (a tab switch takes it from Chrome's tab info) before asking the page, and an empty host is left unknown so the next command checks again.

Verified with a release build in real Chrome: open example.com → tab new https://news.ycombinator.com → tab t1 → tab t2 now prints the hackernews adapters (1.5.159 printed nothing).

Summary by CodeRabbit

• Bug Fixes
  • Site detection now uses a valid URL returned by a command when available, improving the accuracy of the displayed site context.
  • Pages without a recognizable host remain marked as unknown, allowing subsequent commands to check again.

[coderabbitai]

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• cli/src/native/actions.rs

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