refactor: reorganize client transport and extension internals

- Split client, native, remote, serve, markdown, and SDK internals into focused packages with direct imports.
- Move local and remote transport framing/protocol helpers behind clearer module boundaries.
- Break up the extension injected DOM logic into a separate content dispatch bundle and dedicated content modules.
- Add explicit client handling for passive remote discovery without noisy PQ warnings.
- Keep behavior covered with updated unit, integration, and extension tests.

extension/src/commands/navigation.ts

@@ -51,7 +51,16 @@ export class NavigationCommands extends CommandGroup {
 
   private async navTo({ tabId, url }: NavToArgs) {
     const tab = await chrome.tabs.update(tabId, { url });
-    return { id: tab.id, url: tab.url || url };
+    const deadline = Date.now() + 1000;
+    while (tabId && Date.now() < deadline) {
+      const current = await chrome.tabs.get(tabId);
+      const currentUrl = current.url || current.pendingUrl || "";
+      if (currentUrl === url || currentUrl.startsWith(url)) {
+        return { id: current.id, url: currentUrl };
+      }
+      await new Promise(r => setTimeout(r, 50));
+    }
+    return { id: tab.id, url: tab.url || tab.pendingUrl || url };
   }
 
   private async navReload({ tabId }: NavTabArgs, bypassCache: boolean) {