[ENG-631] TopBar improvements & misc fixes (#837)

* fix things

* added back/forward buttons to settings

* split top bar context into left and right

* hook up path

* fix background jobs hidden from job manager

* core

* fix type + quick preview transition

* fix selected item color contrast

* fix close button on quick preview

* clean up job ui for light theme

* Improve media view overscan

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Co-authored-by: Brendan Allan <brendonovich@outlook.com>
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