Two save-button sheets wrapped their body in a bare Column (no scroll): the
germination sheet (which grows a list of past tests) and the condition-check
sheet. On a small phone — especially with the keyboard up — the Save button
was pushed off the bottom, unreachable. Both now wrap the body in a
SingleChildScrollView, like the other input sheets already do.
Also extends the small-phone overflow guard to the profile (identity card +
Save), about, intro carousel, and the market/chat screens in their offline
'set up sharing' state. 17 cases green at 320x568 across es/pt/ast.