refactor: some improved ux.

[knightedcodemonkey]

No description provided.

[Copilot]

Pull request overview

This PR refactors the UI panel headers to improve UX by introducing stacked header rows, adding quick-action icon buttons for copying/clearing sources, and updating preview rendering behavior to better handle toggling Shadow DOM.

Changes:

• Add “copy” and “clear” quick actions for Component and Styles editors, plus supporting clipboard/clear logic.
• Refactor header layout into stacked rows with new CSS utilities (including .sr-only and icon button styling).
• Update preview render targeting to recreate the preview host when switching from ShadowRoot to light DOM.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/styles.css	Adds screen-reader-only utility, stacked panel-header layout helpers, and icon-button styling.
src/index.html	Refactors Component/Styles panel headers into rows and adds copy/clear icon buttons with ARIA labels.
src/app.js	Implements copy/clear actions, clipboard fallback, render target selection, and render-button visibility logic.
package.json	Expands description/keywords to better reflect JSX/CSS playground functionality.

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