feat: the key picker says what sharing does, and skips plain env values

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/sharefiles.go

@@ -131,7 +131,15 @@ func (m *Model) pickShareKey(s sharing) tea.Cmd {
 		return nil
 	}
 	m.search.pickTitle = "Encrypt with which secret?"
-	m.search.pickNote = "Whoever can read it can open the link. share.key sets a default."
+	what := s.files[0].Path
+	if len(s.files) > 1 {
+		what = plural(len(s.files), "env file")
+	}
+	m.search.pickLines = []string{
+		"Sharing " + what + " from " + s.repo.Name + " as an encrypted link.",
+		"Pick the secret to encrypt with: whoever can read it can open the link.",
+		m.st.Muted.Render("Its value isn't shown or put in the link. share.key sets a default."),
+	}
 	m.fillSearch(false)
 	return tea.Batch(cmd, m.searchLoads())
 }