Change mobile interface to be easier to use.

[tarasglek]

We should change the button the left to be "burger" options menu. Should move share into it. Should also move edit system prompt into it...which would scroll up and do equiv of editing system prompt.

We should flip the way mic icon works...instead of holding to record should click it once to start recording and once to stop. This is how bing works on ios.

Should also edit mic icon to when we edit messages and system prompt. Can do that in a followup

Might also make sense to move model selection into this menu.

[kosty]

side menu of the message is quite unusable on mobile when most of the time as well

[humphd]

Two things I noticed this week on mobile:

The Audio Recording button isn't the right size

Also, my fix for the wrapping of the placeholder text in the input element is wrong. On my iOS device, it still wraps.