hotkey support

server/utils/pttBus.ts

@@ -0,0 +1,31 @@
+/**
+ * In-memory push-to-talk event bus.
+ *
+ * Flow: Bridge → POST /api/bridge/ptt → pttBus → WS (/api/bridge/ws) → /pm
+ *
+ * Keyed by bridge token: the Bridge POSTs with its token, and the /pm tab
+ * subscribes over WebSocket with the same token (from its `?token=` link), so
+ * an edge is delivered only to the matching browser.
+ */
+
+export type PttState = 'down' | 'up'
+
+type PttListener = (token: string, state: PttState) => void
+
+class PttBus {
+  private listeners = new Set<PttListener>()
+
+  publish(token: string, state: PttState) {
+    for (const listener of this.listeners) {
+      try { listener(token, state) } catch {}
+    }
+  }
+
+  subscribe(listener: PttListener) {
+    this.listeners.add(listener)
+    return () => { this.listeners.delete(listener) }
+  }
+}
+
+// Singleton — shared across all server handlers
+export const pttBus = new PttBus()