feat: Add FloatingVoice component for voice-to-text input

- Add FloatingVoice component with Web Speech API transcription
- Each component has its own independent WebSocket session
- Voice panel connects on open, disconnects on close
- Sends transcribed text to Claude Code with Enter key

frontend/src/components/FloatingTerminal.vue

@@ -436,7 +436,14 @@ defineExpose({
     isOpen: isOpen.value,
     position: position.value,
     size: size.value
-  })
+  }),
+  sendInput: (text: string) => {
+    if (socket && socket.readyState === WebSocket.OPEN) {
+      socket.send(JSON.stringify({ type: 'input', data: text + '\r' }))
+      return true
+    }
+    return false
+  }
 })
 </script>