initial commit — SIP B2BUA + WebRTC bridge with Rust codec engine

Full-featured SIP router with multi-provider trunking, browser softphone
via WebRTC, real-time Opus/G.722/PCM transcoding in Rust, RNNoise ML
noise suppression, Kokoro neural TTS announcements, and a Lit-based
web dashboard with live call monitoring and REST API.

ts_web/router.ts

@@ -0,0 +1,64 @@
+/**
+ * URL router for the SipRouter dashboard.
+ * Maps URL paths to views in dees-simple-appdash.
+ */
+
+const VIEWS = ['overview', 'calls', 'phone', 'contacts', 'providers', 'log'] as const;
+type TViewSlug = (typeof VIEWS)[number];
+
+class AppRouter {
+  private currentView: TViewSlug = 'overview';
+  private onNavigate: ((view: TViewSlug) => void) | null = null;
+  private suppressPush = false;
+
+  init(): void {
+    // Parse initial URL.
+    const path = location.pathname.replace(/^\/+/, '').split('/')[0] || 'overview';
+    if (VIEWS.includes(path as TViewSlug)) {
+      this.currentView = path as TViewSlug;
+    }
+
+    // Handle browser back/forward.
+    window.addEventListener('popstate', () => {
+      const p = location.pathname.replace(/^\/+/, '').split('/')[0] || 'overview';
+      if (VIEWS.includes(p as TViewSlug)) {
+        this.suppressPush = true;
+        this.navigateTo(p as TViewSlug);
+        this.suppressPush = false;
+      }
+    });
+  }
+
+  setNavigateHandler(handler: (view: TViewSlug) => void): void {
+    this.onNavigate = handler;
+  }
+
+  navigateTo(view: TViewSlug, skipCallback = false): void {
+    this.currentView = view;
+    if (!this.suppressPush) {
+      const url = `/${view}`;
+      if (location.pathname !== url) {
+        history.pushState(null, '', url);
+      }
+    }
+    if (!skipCallback) {
+      this.onNavigate?.(view);
+    }
+  }
+
+  /** Called when the user selects a tab in dees-simple-appdash. */
+  onViewSelect(viewName: string): void {
+    const slug = viewName.toLowerCase().replace(/\s+/g, '-');
+    const mapped = VIEWS.find((v) => v === slug || viewName.toLowerCase().startsWith(v));
+    if (mapped) {
+      this.navigateTo(mapped);
+    }
+  }
+
+  getCurrentView(): TViewSlug {
+    return this.currentView;
+  }
+}
+
+export const appRouter = new AppRouter();
+export type { TViewSlug };