feat: consolidate shared UI and harden browser authority for release

webui/tests/module-loading.test.ts

@@ -0,0 +1,36 @@
+import { importModuleWithRetry } from "../src/platform/moduleLoading";
+
+function assert(condition: unknown, message: string): asserts condition {
+  if (!condition) throw new Error(message);
+}
+
+async function verifyModuleImportRetry() {
+  let attempts = 0;
+  let pauses = 0;
+  const module = { id: "files", uiCapabilities: { "files.fileExplorer": {} } };
+  const imported = await importModuleWithRetry(async () => {
+    attempts += 1;
+    if (attempts === 1) throw new TypeError("Synthetic transient import failure");
+    return module;
+  }, async () => { pauses += 1; });
+  assert(imported === module, "a second successful import preserves the real module descriptor");
+  assert(attempts === 2 && pauses === 1, "a transient failure gets exactly one bounded retry");
+
+  attempts = 0;
+  pauses = 0;
+  const terminal = new TypeError("Synthetic final import failure");
+  let observed: unknown;
+  try {
+    await importModuleWithRetry(async () => { attempts += 1; throw terminal; }, async () => { pauses += 1; });
+  } catch (error) { observed = error; }
+  assert(observed === terminal, "a final failure must be reported, never replaced by an empty or fake module");
+  assert(attempts === 2 && pauses === 1, "permanent failure cannot start an unbounded retry loop");
+
+  attempts = 0;
+  pauses = 0;
+  await importModuleWithRetry(async () => { attempts += 1; return module; }, async () => { pauses += 1; });
+  assert(attempts === 1 && pauses === 0, "healthy imports do not pause or repeat");
+  console.log("Module import retry tests passed.");
+}
+
+void verifyModuleImportRetry().catch((error) => { throw error; });