REFACTOR: consolidate duplicate SVG icon components into centralized pattern

[Talha12Shiekh]

Proposed Changes

This PR consolidates 12 near-identical SVG icon components in packages/web/src/components/shared/ into a single, scalable pattern, eliminating ~600 lines of duplicated code (~83% boilerplate reduction per icon file).

• Centralized Registry (Icons.js): Added a structured iconRegistry mapping icon names (cancel, search, thumbsUp, thumbsDown, mic, mute, listen) to their respective SVG paths, viewBox, xmlns, and keyframe animation styles (@emotion/core).
• Shared Icon Component: Created a reusable, React.forwardRef-enabled Icon component for prop forwarding (onClick, style, className, ref).
• 100% Backwards Compatible Re-exports: Updated individual SVG component files (CancelSvg.js, SearchSvg.js, ThumbsUpSvg.js, ThumbsDownSvg.js, MicSvg.js, MuteSvg.js, ListenSvg.js, AutofillSvg.js, DownloadSvg.js) to thin re-exports from Icons.js.

Checklist

• Describe the proposed changes and how it'll improve the library experience.
• Please make sure that there are no linting errors in the code.
• Add a demo video/gif/screenshot to explain how did you test the fix.
• If it is a global change, try to add any side effects that it could have.
• Create a PR to add/update the docs (if needed) at here.
• Create a PR to add/update the storybook (if needed) at here.

Improvements to the Library Experience

• Maintainability: Adding or updating icon path data or styling can now be done in a single central location (Icons.js).
• Codebase Size: Reduces file clutter and bundle size by removing redundant React imports, emotion styled wrappers, and identical propTypes declarations across 12 files.

Side Effects

• None. All original default export signatures and named exports are preserved, ensuring zero breaking changes for existing consumers or internal components (SearchBox, AIAnswer, SelectedFilters, etc.).

Testing

• Built CommonJS and ES module outputs (yarn build) and verified JSX syntax across all 10 icon files.
• Verified that all default exports (export default SearchSvg, etc.) export valid React elements without breaking component imports.