feat: saved SSH hosts per user, the way in sealed with AES-GCM under a server key kept beside the database

internal/server/web/static/app.css

@@ -852,3 +852,7 @@ dialog.uidlg { max-width:420px; width:92vw; }
 .uidlg form { padding:18px; display:grid; gap:14px; }
 .uidlg .ui-text { margin:0; white-space:pre-wrap; line-height:1.45; }
 .uidlg .ui-input[hidden] { display:none; }
+.sshdlg .chk { display:flex; align-items:center; gap:8px; font-size:13px; color:var(--muted); }
+.sshdlg .chk input { width:auto; }
+.sshdlg .saved-row[hidden] { display:none; }
+.sshdlg .saved-row .frow { align-items:center; }