feat(call, voicemail, ivr): add voicemail and IVR call flows with DTMF handling, prompt playback, recording, and dashboard management

ts_web/state/appstate.ts

@@ -72,6 +72,8 @@ export interface IAppState {
   contacts: IContact[];
   selectedContact: IContact | null;
   logLines: string[];
+  /** Unheard voicemail count per voicebox ID. */
+  voicemailCounts: Record<string, number>;
 }
 
 const MAX_LOG = 200;
@@ -89,6 +91,7 @@ class AppStateManager {
     contacts: [],
     selectedContact: null,
     logLines: [],
+    voicemailCounts: {},
   };
 
   private listeners = new Set<(state: IAppState) => void>();
@@ -155,6 +158,7 @@ class AppStateManager {
             calls: m.data.calls || [],
             callHistory: m.data.callHistory || [],
             contacts: m.data.contacts || [],
+            voicemailCounts: m.data.voicemailCounts || {},
           });
         } else if (m.type === 'log') {
           this.addLog(`${m.ts} ${m.data.message}`);