6102: For #6018 Re-add Search Shortcuts Button r=boek a=BranescuMihai
6106: For #5872 & #6075: Set TabHeader buttons to invisible instead of gone. r=boek a=mcarare
At least one button has to be invisible instead of gone to keep layout height.
Tabs overflow button kept gone to avoid empty space on view end in private mode.
Co-authored-by: Mihai Branescu <branescu.mihai2@gmail.com>
Co-authored-by: mcarare <mihai.carare.dev@gmail.com>
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