- The `setup-localstorage.mjs` test helper polyfills `ResizeObserver` on `globalThis`, which prevented `HashtagStripHelper` from falling back to `window.resize` logic during testing.
- Updated `tests/ui/components/hashtagStripHelper.test.mjs` to temporarily unset `globalThis.ResizeObserver` during tests that verify fallback behavior.
- Ensures the component correctly detects the absence of `ResizeObserver` and falls back to `requestAnimationFrame` or `setTimeout` mechanisms.
Co-authored-by: PR0M3TH3AN <[email protected]>
