[ENG-534] Themes UI & appearance (#896)

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* Themes UI & appearance

* Theme switching + theme hooks + de-select emoji on feedback ui

* un-necessary for now

* hue slider

* tweaks

* ui tweaks

* ui tweaks

* ui tweak

* tweak

* opacity

* change to themeStore instead of get

* cleanup

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Co-authored-by: jake <77554505+brxken128@users.noreply.github.com>

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