feat(orchestrator): radio icon in the header opens the radio spot on every tab

The header radio button opens the radio spot above the main area of the current tab. The Send button, the toolbar radio button and the Radio tab are gone, the mayday clears inside the spot without a Cancel mayday label, and the radio station probe waits for a visible row.

🎯 Fix: 92 %
💥 Break: 4 %
💸 Cost: 100 %
⏱️ Time: 100 %
🛡️ Security: 100 %
🏆 Score: 88
🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 %

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

orchestrator/templates/nav.js

@@ -1,12 +1,12 @@
 const Nav = (() => {
   "use strict";
   const TABS = [["stream", "Stream"], ["agents", "Agents"], ["artifacts", "Artifacts"], ["tasks", "Tasks"]];
-  const SUBS = {stream: [["inbox", "Inbox"], ["rules", "Firewall"], ["radio", "Radio"]]};
+  const SUBS = {stream: [["inbox", "Inbox"], ["rules", "Firewall"]]};
   const VIEWS = [["orbit", "Orbit"], ["chord", "Chord"], ["swimlane", "Swimlane"], ["tree", "Tree"], ["3d", "3D"]];
   const TASK_VIEWS = [["list", "List"], ["board", "Board"], ["rasci", "RASCI"], ["gantt", "Gantt"], ["burn", "Burndown and burnup"], ["3d", "3D"]];
   const OWN = {agents: [["hierarchy", "Hierarchy"]]};
   const ICONS = {
-    stream: "bi-activity", inbox: "bi-inbox", rules: "bi-card-checklist", radio: "bi-boombox", agents: "bi-people", artifacts: "bi-git", tasks: "bi-list-check",
+    stream: "bi-activity", inbox: "bi-inbox", rules: "bi-card-checklist", agents: "bi-people", artifacts: "bi-git", tasks: "bi-list-check",
     orbit: "bi-globe2", chord: "bi-bezier2", swimlane: "bi-bar-chart-steps", tree: "bi-diagram-3", "3d": "bi-badge-3d", hierarchy: "bi-diagram-2",
     list: "bi-list-task", board: "bi-kanban", rasci: "bi-grid-3x3", gantt: "bi-calendar-range", burn: "bi-graph-down-arrow",
   };
@@ -24,6 +24,9 @@ const Nav = (() => {
 
   function route(hash) {
     const [head, sub] = decodeURIComponent(String(hash).replace(/^#/, "")).split("/");
+    if (head === "stream" && sub === "radio") {
+      return {screen: "stream", view: null, redirect: "#stream", spot: true};
+    }
     if (Object.hasOwn(OLD, head)) {
       const [screen, fallback] = OLD[head];
       const view = known(screen, sub) ? sub : fallback;