Create search component for hearing page

[HuanFengYeh]

Summary

This PR add a new search component to the Transcriptions view, allowing users to filter transcript paragraphs based on a search term. It filters data client-side from existing fetched transcripts.

Checklist

• On the frontend, I've made my strings translate-able.
• If I've added shared components, I've added a storybook story.
• I've made pages responsive and look good on mobile.
• If I've added new Firestore queries, I've added any new required indexes to firestore.indexes.json (Please do not only create indexes through the Firebase Web UI, even though the error messages may reccommend it - indexes created this way may be obliterated by subsequent deploys)

Screenshots

Desktop

Mobile

Known issues

Search is basic keyword matching and does not support advanced features.

Steps to test/reproduce

For each feature or bug fix, create a step by step list for how a reviewer can test it out. E.g.:

1. Navigate to a hearing page(/hearing/5265)
2. Ensure the transcript loads and displays paragraphs with timestamps.
   3, Enter a search term in the "search term place holder".
3. Verify that only matching paragraphs are shown, with the search term highlighted in yellow.
4. Clear the search input and confirm all paragraphs reappear.
5. Scroll through the transcript and ensure the search bar remains fixed at the top, not scrolling away.
6. Enter a non-matching term and confirm the "No results found" message appears.

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Project	Deployment	Preview	Comments	Updated (UTC)
maple-dev	Ready	Preview	Comment	Oct 8, 2025 0:17am

[Mephistic]

Looking good - we just need to fix the translation strings and this should be ready to merge. Thanks for tackling this!

[Mephistic]

nit: It looks like we still need to update the translation json file to have these keys - placeholder/no_results are currently only available under the search json (for the main bill/testimony search pages), so we need to add this to the hearing translation json file.