feat: add minimal reproducer for channel moderation test crash

Adds a standalone Node.js script that reproduces the TypeError seen in
`tests/app/channel-profile-moderation.test.mjs`. The crash occurs because
the test harness instantiates `Application` without running the constructor,
leaving `moderationDecorator` undefined.

The reproducer demonstrates this by using `Object.create(Application.prototype)`
and attempting to call `decorateVideoModeration`.

examples/reproducers/issue-channel-moderation-test-crash/README.md

@@ -0,0 +1,41 @@
+# Reproducer for Channel Moderation Test Crash
+
+This reproducer demonstrates a bug in the test harness setup used in `tests/app/channel-profile-moderation.test.mjs`.
+
+## Issue Description
+
+The test helper `createModerationAppHarness` in `tests/helpers/moderation-test-helpers.mjs` instantiates the `Application` class using `Object.create(Application.prototype)`, bypassing the constructor.
+
+The `Application` constructor is responsible for initializing `this.moderationDecorator`.
+
+When `app.decorateVideoModeration()` is called (which is done in `renderChannelVideosFromList`), it attempts to call `this.moderationDecorator.decorateVideo()`. Since `this.moderationDecorator` is undefined, it throws a `TypeError: Cannot read properties of undefined (reading 'decorateVideo')`.
+
+This causes tests in `tests/app/channel-profile-moderation.test.mjs` to fail with exit code 1.
+
+## How to Run
+
+Run the reproducer script:
+
+```bash
+node examples/reproducers/issue-channel-moderation-test-crash/repro.mjs
+```
+
+A successful run (reproduction of the crash) will output:
+`SUCCESS: Caught expected error: Cannot read properties of undefined (reading 'decorateVideo')`
+
+## Fix (Recommendation)
+
+The `createModerationAppHarness` helper should ensure `moderationDecorator` is initialized on the mock `Application` instance, or use a method of instantiation that runs the constructor (if feasible with mocks).
+
+Example fix in `tests/helpers/moderation-test-helpers.mjs`:
+
+```javascript
+  // ... inside createModerationAppHarness
+  const app = Object.create(Application.prototype);
+  // ...
+  // Manually initialize moderationDecorator since constructor is skipped
+  app.moderationDecorator = new ModerationDecorator({
+      getProfileCacheEntry: (pubkey) => app.getProfileCacheEntry(pubkey),
+  });
+  // ...
+```

examples/reproducers/issue-channel-moderation-test-crash/repro.mjs

@@ -0,0 +1,36 @@
+import { JSDOM } from "jsdom";
+import "../../../tests/test-helpers/setup-localstorage.mjs";
+
+// Mock globals for Application load
+const dom = new JSDOM("<!DOCTYPE html><html><body></body></html>", {
+  url: "https://example.com",
+});
+globalThis.window = dom.window;
+globalThis.document = dom.window.document;
+globalThis.HTMLElement = dom.window.HTMLElement;
+// Override WebSocket if setup-localstorage didn't do it or if we need a close method
+globalThis.WebSocket = class { close() {} };
+
+// Import Application
+const { Application } = await import("../../../js/app.js");
+
+console.log("Creating Application instance bypassing constructor...");
+// This replicates what createModerationAppHarness does in tests/helpers/moderation-test-helpers.mjs
+const app = Object.create(Application.prototype);
+
+// Attempt to call decorateVideoModeration which relies on this.moderationDecorator
+// initialized in constructor.
+try {
+  console.log("Attempting to call decorateVideoModeration...");
+  app.decorateVideoModeration({});
+  console.log("FAIL: decorateVideoModeration did not throw.");
+  process.exit(1);
+} catch (error) {
+  if (error instanceof TypeError && error.message.includes("decorateVideo")) {
+    console.log("SUCCESS: Caught expected error:", error.message);
+    process.exit(0); // Exit success
+  } else {
+    console.log("FAIL: Caught unexpected error:", error);
+    process.exit(1);
+  }
+}