Zoom SDK Mobile Styling Fix

I need an experienced developer to adjust the styling for a website with Zoom Video SDK embedded.

Requirements:
- Reproduce the bug from the provided minimal repo with one command: `npm run dev`.
- Fix the issue so the header and controls display properly on iPhone 12 and Galaxy S21 emulators (using Chrome DevTools), without breaking the desktop layout.
- Controls to be fixed: Video, Audio, Chat, and Screen Sharing.

Ideal Skills:
- Proficient in React 18, Vite, TypeScript
- Experience with Zoom Video SDK and UI-Toolkit
- Knowledgeable in Sass modules
- Ability to explain the root cause of the issue concisely

Deliverables:
- Git patch / pull request targeting branch `fix/mobile-controls`
- One-paragraph root-cause analysis

Access Policy:
- No full private repo access will be granted.
- Work via VS Code Live Share sessions or a stripped-down demo repo.
- NDA required; all code remains DigiTerapia property and may not be reused elsewhere.