Base ui changes 05
Closes #34403 (closed) #40015 (closed) #40016 (closed) #40031 (closed)
Also changing the app home screen icon (including that in #40020 (closed))
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Closes #34403 (closed) #40015 (closed) #40016 (closed) #40031 (closed)
Also changing the app home screen icon (including that in #40020 (closed))