feat(editor): F4.6a simulation mode and a computer's desktop

Java's mode buttons start and stop the room, now in a worker of the
editor's page (LocalSimHost), with Java's speed slider. While the
simulation runs the design is locked as in Java: no palette, no sheet,
nothing moves, no undo. Cables that carry a frame light up in Java's
green, and a tap on a computer opens its desktop: Java's title, the
software installation first, then the installed programs in the order
of Java's list for the language, a taskbar with the network icon and
the network as the simulation runs it. The room sends that over a new
topic, node:<id>. Desktops stay over a return to the design and show
again at the next start. The programs' windows follow from F4.6b.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/editor/src/i18n/en.json

@@ -22,6 +22,9 @@
   "design.palette": "Components",
   "design.redo": "Redo",
   "design.undo": "Undo",
+  "desktop.home": "Home Screen",
+  "desktop.installation": "Software Installation",
+  "desktop.network": "Network",
   "dev.example": "Example",
   "dev.newProject": "New project",
   "dev.openFile": "Open file …",
@@ -79,6 +82,29 @@
   "menu.delete": "Delete",
   "menu.removeAllCables": "Remove all cables",
   "menu.removeCable": "Remove cable",
+  "menu.showDesktop": "Show desktop",
+  "mode.currentSpeed": "Current Simulation Velocity",
+  "mode.design": "Change to Design Mode",
+  "mode.simulation": "Change to Simulation Mode",
+  "mode.speed": "Adjust Simulation Velocity",
+  "network.dnsServer": "DNS server:",
+  "network.gateway": "Gateway:",
+  "network.ipAddress": "IP address:",
+  "network.macAddress": "MAC address:",
+  "network.subnetMask": "Netmask:",
+  "program.commandPrompt": "Command Line",
+  "program.dnsServer": "DNS server",
+  "program.echoServer": "Echo server",
+  "program.emailClient": "Email program",
+  "program.emailServer": "Email server",
+  "program.fileExplorer": "File explorer",
+  "program.firewall": "Firewall",
+  "program.gnutella": "Gnutella",
+  "program.imageViewer": "Image viewer",
+  "program.simpleClient": "Generic client",
+  "program.textEditor": "Text editor",
+  "program.webBrowser": "Webbrowser",
+  "program.webServer": "Webserver",
   "route.destinationNetwork": "Destination",
   "route.gateway": "Next gateway",
   "route.interfaceIPAddress": "NIC",
@@ -127,6 +153,7 @@
   "sheet.switchSsid": "Wi-Fi Name (SSID)",
   "sheet.title": "Settings",
   "sheet.wireless": "Wireless (Wi-Fi)",
+  "sim.failed": "The simulation ran into an error and was stopped.",
   "zoom.fit": "Show all",
   "zoom.in": "Zoom in",
   "zoom.level": "{percent} %",