Add variableValue helper and re-render on dashboard refresh

[asimonok]

Due to variable helper limitation (works only if variable format is not specified). Was added variableValue helper to use replaced variable value.

Example of usage:

<a href="http://localhost?{{variableValue '${slug:queryparam}'}}">Link</a>

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e651bfb) 98.97% compared to head (26c61d2) 98.74%.

Files	Patch %	Lines
src/components/TextPanel/TextPanel.tsx	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #252 +/- ## ========================================== - Coverage 98.97% 98.74% -0.23% ========================================== Files 34 34 Lines 389 399 +10 Branches 50 50 ========================================== + Hits 385 394 +9 - Misses 3 4 +1 Partials 1 1 ```

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