refactor: convert remaining UI files to TS

[jescalada]

Fixes #1229.

Note that some UI files (old components, stylesheets) haven't been converted to TS. This is because we'll be removing those in #1106 to simplify UI dependencies and clean up the codebase.

[netlify]

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🔨 Latest commit	8c68e8c
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.64%. Comparing base (ae97d83) to head (8c68e8c).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1256   +/-   ##
=======================================
  Coverage   82.64%   82.64%           
=======================================
  Files          70       70           
  Lines        3007     3007           
  Branches      501      501           
=======================================
  Hits         2485     2485           
  Misses        419      419           
  Partials      103      103           

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[andypols]

LGTM

[jescalada]

@andypols Thanks for the review!