fix: Widget panel fixes

[mofojed]

• Allow JSX.Element to be passed into a context action title
  • We already supported it, but we just didn't allow the type
• Reset isDisconnected flag when the model is initialized
  • On reconnect, the model was reloading but it was staying in a "disconnected" state

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 46.61%. Comparing base (2744f97) to head (e79a534).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2227 +/- ## ======================================= Coverage 46.61% 46.61% ======================================= Files 692 692 Lines 38508 38508 Branches 9826 9802 -24 ======================================= Hits 17949 17949 Misses 20506 20506 Partials 53 53 ``` | [Flag](https://app.codecov.io/gh/deephaven/web-client-ui/pull/2227/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/deephaven/web-client-ui/pull/2227/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven) | `46.61% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.