fix: agent update runs as root when it can (sudo without a password otherwise), checks the download, restarts reliably and reports its result; one-colour file icons; zip and delete on one line on phones; PIN buttons alike; no key fingerprint in the SSH status; corner plus clears split panes

internal/server/web/templates/terminal.html

@@ -82,7 +82,9 @@
   body.multi .area { margin-top:0; border-top-left-radius:0; }
   .float-add { position:absolute; top:8px; right:10px; z-index:6; width:28px; height:28px; padding:0; display:inline-flex;
                align-items:center; justify-content:center; font-size:17px; line-height:1; color:var(--text);
-               background:transparent; border:1px solid var(--border); opacity:.28; transition:opacity .25s ease, background .25s ease; }
+               background:transparent; border:1px solid var(--border); opacity:.28; transition:opacity .25s ease, background .25s ease, top .25s ease; }
+  /* One tab split in panes: below the panes' title bars, clear of their close buttons. */
+  body.split1 .float-add { top:42px; }
   .float-add:hover, .float-add:focus-visible { opacity:1; background:var(--panel); }
   body.multi .float-add { opacity:0; pointer-events:none; }
   .tabview { position:absolute; inset:8px; opacity:0; visibility:hidden; transform:translateY(4px) scale(.995);