fix: stage sandbox media for inbound attachments

src/web/inbound.media.test.ts

@@ -5,18 +5,22 @@ import path from "node:path";
 
 import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
 
-vi.mock("../config/config.js", () => ({
-  loadConfig: vi.fn().mockReturnValue({
-    whatsapp: {
-      allowFrom: ["*"], // Allow all in tests
-    },
-    messages: {
-      messagePrefix: undefined,
-      responsePrefix: undefined,
-      timestampPrefix: false,
-    },
-  }),
-}));
+vi.mock("../config/config.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../config/config.js")>();
+  return {
+    ...actual,
+    loadConfig: vi.fn().mockReturnValue({
+      whatsapp: {
+        allowFrom: ["*"], // Allow all in tests
+      },
+      messages: {
+        messagePrefix: undefined,
+        responsePrefix: undefined,
+        timestampPrefix: false,
+      },
+    }),
+  };
+});
 
 const HOME = path.join(
   os.tmpdir(),

src/web/monitor-inbox.test.ts

@@ -20,9 +20,13 @@ const mockLoadConfig = vi.fn().mockReturnValue({
   },
 });
 
-vi.mock("../config/config.js", () => ({
-  loadConfig: () => mockLoadConfig(),
-}));
+vi.mock("../config/config.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../config/config.js")>();
+  return {
+    ...actual,
+    loadConfig: () => mockLoadConfig(),
+  };
+});
 
 vi.mock("./session.js", () => {
   const { EventEmitter } = require("node:events");

src/web/test-helpers.ts

@@ -31,13 +31,17 @@ export function resetLoadConfigMock() {
   (globalThis as Record<symbol, unknown>)[CONFIG_KEY] = () => DEFAULT_CONFIG;
 }
 
-vi.mock("../config/config.js", () => ({
-  loadConfig: () => {
-    const getter = (globalThis as Record<symbol, unknown>)[CONFIG_KEY];
-    if (typeof getter === "function") return getter();
-    return DEFAULT_CONFIG;
-  },
-}));
+vi.mock("../config/config.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../config/config.js")>();
+  return {
+    ...actual,
+    loadConfig: () => {
+      const getter = (globalThis as Record<symbol, unknown>)[CONFIG_KEY];
+      if (typeof getter === "function") return getter();
+      return DEFAULT_CONFIG;
+    },
+  };
+});
 
 vi.mock("../media/store.js", () => ({
   saveMediaBuffer: vi