Migrate datetime to typescript

[Chris4942]

Changes

Issues

Code assistance

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• I have read and followed the contributing guidelines.
• I have tested these changes.
  • dates look the same in:
    • in admin dashboard logs
      • 7/17/2026 12:19 PM
    • card series time
      • This code path is only hit if showSeriesTimerChannel is true which seems to only be true in the livetv case. (I didn't know that jellyfin supported live tv streams, so I'm not really sure how to test this one)
    • useTextLines
      • These changes also seem to only apply to live tv
    • useIndicator (wherever that's used)
    • usePrimaryMediaInfo (wherever that's usd
• I have verified that this is not duplicating changes in an existing PR.
• I have provided a substantive review of another web PR.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud