Added multiple video handling to frontend

[delexagon]

Summary

Addresses the frontend work for #2015. This is meant to be cross-compatible with the existing design and the future design.

Checklist

• On the frontend, I've made my strings translate-able.
• I've made pages responsive and look good on mobile.

Screenshots

Known issues

I'm pretty sure I'm going to have to create a way to address longer (overflowing) names, and I haven't implemented that yet. I've tested this, but I'm probably going to want to look it over again once I get to the other side.

Steps to test/reproduce

1. Check all existing transcription related features. There should be no visual or functional changes for hearings with only one video (other than the change to 'Loading transcript for this hearing...'.
2. The way I've been testing multiple videos is by manually injecting JSON into hearing.ts. It's kind of awkward, but it works. If you want to do this, the JSON I've been using for testing is

videos: [
      {
        "title": "part 1",
        "url": "https://prodarchivevideo.blob.core.windows.net/video/2025/Hearings/Joint/July/01_2.mp4",
        "transcriptionId": "68feedc9-35ca-49ea-bf99-0fdb02e2f5a2",
        "fetchedAt":  {
            "seconds": 1752077206,
            "nanoseconds": 92000000
        }
      },
      {
        "title": "part 3",
        "url": "https://prodarchivevideo.blob.core.windows.net/video/2025/Hearings/Joint/July/01_2.mp4",
        "fetchedAt":  {
          "seconds": 1752077210,
          "nanoseconds": 92000000
        }
      },
      {
        "title": "part 2",
        "url": "https://prodarchivevideo.blob.core.windows.net/video/2025/Hearings/Joint/July/15_3.mp4",
        "transcriptionId": "d656eb4a-17c3-45c1-ab65-c9d75691b644",
        "fetchedAt":  {
          "seconds": 1752077210,
          "nanoseconds": 92000000
        }
      }
    ]

4. With multiple videos, test that the transcription changes while moving between videos, both as download and as element. The transcript highlight should be reset when changing videos. The transcript highlight should always reflect the currently active video. The ?t= parameter should affect the video in ?v=, and should only be erased when changing the active video. The ?v= parameter should always reflect the currently active video. If a video has not had a transcription generated for it yet, it should correctly display that there is no transcript available. Moving to and from this state to a state with a transcript should not generate any errors. Etc.

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Project	Deployment	Actions	Updated (UTC)
maple-dev	Ready	Preview, Comment	Apr 1, 2026 0:42am

[delexagon]

FAIL src/malegislature.test.ts
Not sure why this happened

[Mephistic]

LGTM - just need to resolve the merge conflict

[delexagon]

Uh, I need to make sure that that push doesn't break anything.

[delexagon]

Remaking