Add write_samples and description control from waterfall UI.

[anarkiwi]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.91%. Comparing base (ac2668d) to head (0f2b39e).
Report is 1 commits behind head on main.

Files	Patch %	Lines
gamutrfwaterfall/gamutrfwaterfall/flask_handler.py	0.00%	6 Missing ⚠️
gamutrf/grscan.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1346      +/-   ##
==========================================
- Coverage   74.05%   73.91%   -0.15%     
==========================================
  Files          37       37              
  Lines        2945     2952       +7     
==========================================
+ Hits         2181     2182       +1     
- Misses        764      770       +6     

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