fix: correct main heading hierarchy

[saurabhhhcodes]

Closes #69

Summary

• keep the sticky header brand text visually unchanged without rendering a second page-level h1
• promote reusable editor section labels from h3 to h2 so the main page follows h1 -> h2 order
• verified the app shell, home page, and video editor now expose one h1 and no skipped heading level in the targeted files

Validation

• npx tsc --noEmit --pretty false
• npm run lint -- --file src/app/layout.tsx --file src/app/page.tsx --file src/components/VideoEditor.tsx
• npm run build
• git diff --check

Note: dependency install required npm install --legacy-peer-deps because the repo currently has a React 19 / @testing-library/react 14 peer dependency conflict under plain npm install. No dependency or lockfile changes are included.

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👋 Thanks for your PR, @saurabhhhcodes!

Welcome to Reframe — a browser-based video editor built for everyone 🎬

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