Add dither support to remote focus waveforms

[AdvancedImagingUTSW]

Introduce dither amplitude/frequency parameters for remote-focus channels and wire them through config, UI, model and tests.

• config: add default string keys ("dither_amplitude", "dither_frequency") in verify_waveform_constants and include entries in waveform_constants.yml.
• view: add Dither Amplitude and Dither Frequency inputs to WaveformParameterPopupWindow.
• controller: WaveformPopupController now tracks dither variables, traces, validation, UI configuration, and stores values with existing amplitude/offset settings; enables/disables dither controls when live mode toggles.
• model: RemoteFocusBase gains robust parsing helper get_remote_focus_setting to coerce and validate string inputs, reads dither settings, and if both dither amplitude and frequency are >0 overlays a triangle dither waveform onto the remote-focus waveform.
• waveforms: add triangle_wave() utility used to generate the dither signal.
• tests: update existing tests to expect the new keys and widget values, add test to ensure dither is applied after smoothing, and add a waveform-tab test to verify the updated remote-focus waveform is plotted.

Also includes related minor refactors and logging updates for remote-focus setting changes.

[codecov]

Codecov Report

❌ Patch coverage is 83.82353% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.93%. Comparing base (a197d21) to head (cc8eb17).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...igate/controller/sub_controllers/waveform_popup.py	79.48%	8 Missing ⚠️
src/navigate/model/devices/remote_focus/base.py	83.33%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1205      +/-   ##
===========================================
+ Coverage    63.64%   63.93%   +0.28%     
===========================================
  Files          189      189              
  Lines        26029    26085      +56     
===========================================
+ Hits         16567    16677     +110     
+ Misses        9462     9408      -54     

Flag	Coverage Δ
unittests	63.93% <83.82%> (+0.28%)	⬆️

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