fix(a11y): Adapt to small screens 320x256

Related to #658 (closed)

Issues in small screens (320x256):

• Screen 'sélection des astuces', can't see the ecogeste, it's hidden by action buttons
  

Design small problems to address:

• Screen 'action' should have a bigger background
  

• Screen 'Analyse', could set unity (kWh and % to be inline with the amount) -> OK with width = 358px