Add minimal reproducers for known bugs

- Added reproducer for mobile sidebar margin mismatch (tests/visual/overlay-layers.spec.ts).
- Added reproducer for Moderation UI "Show anyway" button visibility (tests/visual/moderation.spec.ts).
- Added reproducer for NIP-07 login unit test ReferenceError (tests/nostr-login-permissions.test.mjs).
- Added examples/reproducers/playwright.config.ts to support running these tests.
- Updated examples/reproducers/README.md with instructions.

Co-authored-by: PR0M3TH3AN <[email protected]>

examples/reproducers/README.md

@@ -21,3 +21,34 @@ Example structure:
 - `buildVideoPostEvent` crashes on circular objects if not handled (Fixed).
 - `normalizeAndAugmentMagnet` crashes on non-iterable `extraTrackers` (Fixed).
 - `build...` functions crash on `null`/`undefined` input (Fixed).
+
+# Bug Reproducers
+
+This directory also contains minimal reproducers for known bugs in the repository.
+
+## Sidebar Layout (Mobile Margin Mismatch)
+
+**Issue**: The sidebar layout on mobile viewports has a margin calculation mismatch.
+**Reproducer**: `examples/reproducers/issue-sidebar-layout/repro.spec.ts`
+**Run**:
+```bash
+npx playwright test -c examples/reproducers/playwright.config.ts examples/reproducers/issue-sidebar-layout/repro.spec.ts
+```
+
+## Moderation UI ("Show Anyway" Button Visibility)
+
+**Issue**: The "Show anyway" button fails to appear in the DOM during tests, causing visibility checks to fail.
+**Reproducer**: `examples/reproducers/issue-moderation-ui/repro.spec.ts`
+**Run**:
+```bash
+npx playwright test -c examples/reproducers/playwright.config.ts examples/reproducers/issue-moderation-ui/repro.spec.ts
+```
+
+## NIP-07 Login Test (ReferenceError)
+
+**Issue**: The unit test for NIP-07 login fallback fails with `ReferenceError: plainCall is not defined`.
+**Reproducer**: `examples/reproducers/issue-nip07-login/repro.mjs`
+**Run**:
+```bash
+node examples/reproducers/issue-nip07-login/repro.mjs
+```