Mobile Budget Page

❌ Issue

On Mobile, on a Budget page:

• The layout of this page is not optimal on Mobile
• The dropdown Trier les projets par is on two-line
• The buttons Ajouter don't have the right horizontal padding

✅ Expected

• Use available horizontal space for the Trier les projets par dropdown to make it fit on one line
• Horizontal padding for the Ajouter buttons should be the same as vertical padding