[codex] fix: preserve localhost preview hosts

apps/web/src/browser/browserTargetResolver.test.ts

@@ -47,6 +47,14 @@ describe("browser target resolver", () => {
     ).toBe("http://localhost:3000/app");
   });
 
+  it("preserves localhost server-picker values when the prepared base is 127.0.0.1", async () => {
+    readPreparedConnection.mockReturnValue({ httpBaseUrl: "http://127.0.0.1:3773" });
+    const { resolveDiscoveredServerUrl } = await import("./browserTargetResolver");
+    expect(
+      resolveDiscoveredServerUrl(EnvironmentId.make("environment-1"), "localhost:5173/app?x=1#top"),
+    ).toBe("http://localhost:5173/app?x=1#top");
+  });
+
   it("normalizes public URLs without treating them as environment ports", async () => {
     const { resolveDiscoveredServerUrl } = await import("./browserTargetResolver");
     expect(resolveDiscoveredServerUrl(EnvironmentId.make("environment-1"), "example.com/app")).toBe(

apps/web/src/browser/browserTargetResolver.ts

@@ -24,6 +24,11 @@ const isPrivateNetworkHost = (host: string): boolean => {
   );
 };
 
+const isLocalLoopbackHost = (host: string): boolean => {
+  const normalized = host.toLowerCase().replace(/^\[|\]$/g, "");
+  return normalized === "localhost" || normalized === "127.0.0.1" || normalized === "::1";
+};
+
 export function resolveBrowserNavigationTarget(
   environmentId: EnvironmentId,
   target: BrowserNavigationTarget,
@@ -68,6 +73,12 @@ export function resolveDiscoveredServerUrl(environmentId: EnvironmentId, rawUrl:
     const normalizedUrl = normalizePreviewUrl(rawUrl);
     const parsed = new URL(normalizedUrl);
     if (!isLoopbackHost(parsed.hostname)) return normalizedUrl;
+    const connection = readPreparedConnection(environmentId);
+    if (!connection) throw new Error(`Environment ${environmentId} is not connected.`);
+    const environmentUrl = new URL(connection.httpBaseUrl);
+    if (parsed.hostname !== "0.0.0.0" && isLocalLoopbackHost(environmentUrl.hostname)) {
+      return normalizedUrl;
+    }
     const port = Number(parsed.port || (parsed.protocol === "https:" ? 443 : 80));
     return resolveBrowserNavigationTarget(environmentId, {
       kind: "environment-port",