fix(web): /machine terminal visible prop, stop/restart confirmation, accurate waiting label

apps/next/src/components/machine/machine-shell.tsx

@@ -235,6 +235,13 @@ export const MachineShell = () => {
 
   const activeFile = activeFilePath ? files[activeFilePath] : undefined;
   const running = Boolean(status?.running);
+  const starting = pendingAction === 'start' || pendingAction === 'restart';
+  // The terminal only shows this while the box is not running. Distinguish a box
+  // that is starting/restarting from one that is simply stopped so the label is
+  // accurate instead of always claiming "Starting…".
+  const terminalWaitingLabel = starting
+    ? 'Starting your machine…'
+    : 'Machine is stopped — start it to open a terminal.';
 
   return (
     <main className='space-y-6'>
@@ -339,9 +346,10 @@ export const MachineShell = () => {
         >
           <XtermSession
             active={running}
+            visible={activeTab === 'terminal'}
             tokenUrl='/api/box/terminal-token'
             sessionKey={username}
-            waitingLabel='Starting your machine…'
+            waitingLabel={terminalWaitingLabel}
             label='your machine'
           />
         </TabsContent>