* follow existing popout guard pattern to force popout on firefox when filepicker is exposed
* move firefox guard to tools ownership & revert changes to auth owned file
* initial refactor to consolidate logic using file-picker-popout.guard
* remove safari from guard & disable forced popout in vault import
* enforce popout on Safari with test coverage
* use userAgent and consistent detection for platform detection
* refactor guard tests involving routes
* replace imports lost during merge
* remove text sends from popout requirement and update tests
* add tooltip and screen-reader text describing popout behavior
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