frontend: improve websocket reconnect strategy

[aabadie]

Sometimes the UI is stalled blank for several seconds before websocket reconnects and that is annoying. The problem is gone with this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.98%. Comparing base (89c0629) to head (70de9ab).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   66.98%   66.98%           
=======================================
  Files          41       41           
  Lines        4050     4050           
=======================================
  Hits         2713     2713           
  Misses       1337     1337           

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