[uellue]

Replaces the double update and double push per GUI event with a single update that calls the data callbacks explicitly, and shows results and errors of the table actions in the GUI.

Changes

• One data update and push per event, see the docstring of update_with_force()
• Status message next to each table with the fit residual or the error of its actions
• README describes Model4DSTEM.lambdify() and the numeric example

Behavior changes

• GUI events are faster, since the UDFs run once instead of twice per event
• The cross-correlation refinement updates the frames and plots in a notebook
• Applying a table without points shows an error instead of doing nothing
• In focus, model changes keep the feature selection on the detector unchanged, as moving the feature does
• The sections of the GUI are in their order from before the cleanup PR again

Review notes

• Event handling was tested by hand in a notebook; the tests run without a browser and check the callbacks with a held Bokeh document
• The layout still moves slightly when a status message appears or disappears

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.65%. Comparing base (c991632) to head (2e4f9d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   96.18%   96.65%   +0.46%     
==========================================
  Files          14       14              
  Lines        2124     2151      +27     
  Branches      191      192       +1     
==========================================
+ Hits         2043     2079      +36     
+ Misses         51       47       -4     
+ Partials       30       25       -5     

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