[BUG]: Missing component imports in easemotion.css entry point and minified bundle

[Dharm3112]

Pull Request Description

This PR submits a showcase and verification demo for the four framework components (`chip.css`, `footer.css`, `scroll-progress.css`, and  `sidebar.css`) that are currently present in the `components/` directory but missing from the main `easemotion.css` entry file and compiled  bundles.

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Type of Change

- [ ] ✨ New animation / hover effect
- [ ] 🧩 New component
- [ ] [x] Documentation improvement
- [ ] [x] Bug fix in an existing submission
- [x] Other: Verification showcase and framework bug documentation

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Submission Checklist

- [x] All changes are inside `submissions/examples/missing-components-showcase/`
- [x] Includes `demo.html` — self-contained, opens in browser with no server
- [x] Includes `style.css` — raw CSS for the proposed feature
- [x] Includes `README.md` — what it does, how to use it, why it fits EaseMotion CSS
- [x] **No changes to `core/`**
- [x] **No changes to `components/`**
- [x] One feature per PR (no bundled unrelated changes)

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Feature Description

What does this add?

This submission adds a verification and feature showcase for the missing components (Chip, Footer, Scroll Progress, and Sidebar) to prove their functionality and demonstrate how they behave when loaded into a cohesive dashboard layout.

How does a developer use it?

    <!-- Scroll Progress: -->
    <div class="ease-scroll-progress ease-scroll-progress-root"></div>

    <!-- Multi-select Chip Group: -->
    <div class="ease-chip-group">
      <label>
        <input type="checkbox">
        <span class="ease-chip">Label</span>
      </label>
    </div>

    <!-- Footer Component: -->
    <footer class="ease-footer">
      <div class="ease-footer-grid">...</div>
    </footer>

Why does it fit EaseMotion CSS?

  It acts as a complete, unified layout demonstration for these built-in components and helps ensure that they are successfully integrated into the core package imports.
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## Demo

[✓] Demo added ( demo.html  works by opening directly in a browser)

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## Browser Testing

  [✓] Chrome
  [✓] Firefox
  [✓] Edge
  [✓] Safari
──────

## Notes for Maintainer

  This showcase demonstrates that all four components ( chip.css ,  footer.css ,  scroll-progress.css , and  sidebar.css ) are fully functional. To resolve the root issue, these stylesheets just need to be imported in the main  easemotion.css  entry file:

    @import "./components/chip.css";
    @import "./components/footer.css";
    @import "./components/scroll-progress.css";
    @import "./components/sidebar.css";

  Once added there, they will automatically compile into  easemotion min.css  during the next release build.

[github-actions]

📊 CSS Bundle Size Benchmark

This PR changes the size of easemotion.min.css.

Metric	Base Branch	This PR	Difference
Raw	47.43 KB	47.45 KB	📈 +0.02 KB
Gzip	8.34 KB	8.35 KB	📈 +0.01 KB
Brotli	7.13 KB	7.16 KB	📈 +0.03 KB