Truncate bill summary to 1000 chars and add modal for longer summaries

[Mephistic]

Summary

This PR just provides a slightly better experience for ballot initiative bills with longer summaries - we now truncate the summary to 1000 chars and add a modal for longer summaries (similar to the bill text modal).

Checklist

• On the frontend, I've made my strings translate-able.
• [N/A] If I've added shared components, I've added a storybook story.
• I've made pages responsive and look good on mobile.
• [N/A] 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

TBD

Known issues

N/A

Steps to test/reproduce

1. Go to a ballot initiative bill page with a short summary (like /bills/194/H5001) and confirm that there is no modal trigger
2. Go to a ballot initiative bill page with a long summary (like /bills/194/H5010) and confirm that the modal triggers as expected.

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Project	Deployment	Actions	Updated (UTC)
maple-dev	Ready	Preview, Comment	Mar 24, 2026 10:56pm

[Mephistic]

Going to merge to move this along - post-merge feedback is always welcome