fix(cat): the chip opens the radio menu with one radio too

It only became a menu from two radios, on the reasoning that a single
radio has nothing to switch to. That hides the feature from precisely the
operator who has not made a second radio yet — the click lands on a
settings dialog they did not ask for, which is what happened on the first
try. With one radio the menu now shows that radio and 'Add a radio…'.

Right-click still goes straight to the CAT settings.

frontend/package.json.md5

@@ -1 +1 @@
-f9b41e192918fa2511f68cd1b361fcd3
+704fe1bf370b669665df0606fae8a69d

frontend/src/App.tsx

@@ -316,15 +316,22 @@ function RadioChip({ catUp, catState, onOpenSettings }: {
   const label = catUp
     ? (catState.rig || 'CAT')
     : (catState.enabled ? (shortCatError(catState.error) || 'CAT off') : 'CAT');
-  const many = radios.length > 1;
+  // The menu opens with ONE radio too.
+  //
+  // It was only shown from two, on the reasoning that a single radio has
+  // nothing to switch to — but that hides the feature exactly from the operator
+  // who has not made a second radio yet, and the click lands on the settings
+  // dialog they were not asking for. With one radio the menu shows that radio
+  // and the way to add another.
+  const has = radios.length > 0;
 
   return (
     <div ref={ref} className="relative">
       <button
         type="button"
-        onClick={() => { if (!many) { onOpenSettings(); return; } load(); setOpen((o) => !o); }}
+        onClick={() => { if (!has) { onOpenSettings(); return; } load(); setOpen((o) => !o); }}
-        title={many
+        title={has
-          ? 'Switch radio — right-click for the CAT settings'
+          ? 'Radios — right-click for the CAT settings'
           : (catUp ? `CAT: ${catState.rig || catState.backend || 'connected'}` : (catState.error || 'CAT'))}
         onContextMenu={(e) => { e.preventDefault(); onOpenSettings(); }}
         className={cn('inline-flex items-center gap-1.5 h-5 px-2 rounded-full border text-[11px] transition-colors',
@@ -332,9 +339,9 @@ function RadioChip({ catUp, catState, onOpenSettings }: {
       >
         <span className={cn('size-2 rounded-full', catUp ? 'bg-success' : 'bg-muted-foreground/40')} />
         <span className="inline-flex items-center gap-1"><RadioTower className="size-3" />{label}</span>
-        {many && <ChevronUp className="size-3 opacity-60" />}
+        {has && <ChevronUp className="size-3 opacity-60" />}
       </button>
-      {open && many && (
+      {open && has && (
         <div className="absolute bottom-full left-0 mb-1 z-50 min-w-44 rounded-md border border-border bg-card shadow-lg py-1">
           {radios.map((r) => (
             <button
@@ -356,7 +363,7 @@ function RadioChip({ catUp, catState, onOpenSettings }: {
           <div className="my-1 border-t border-border/60" />
           <button type="button" onClick={() => { setOpen(false); onOpenSettings(); }}
             className="w-full px-2.5 py-1 text-left text-xs text-muted-foreground hover:bg-muted">
-            Radios…
+            {radios.length > 1 ? 'Radios…' : 'Add a radio…'}
           </button>
         </div>
       )}