Improve live fitting feedback and posterior uncertainty displays

[AndrewSazonov]

Add a shared activity indicator for standard, sequential, and Bayesian fitting in terminal and Jupyter, keep fit progress visible during long plateaus, harden cleanup on solver failures, and standardize posterior uncertainty wording to 95% credible interval.

[codecov]

Codecov Report

❌ Patch coverage is 81.64384% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.37%. Comparing base (a6e8099) to head (d340581).

Files with missing lines	Patch %	Lines
src/easydiffraction/display/progress.py	72.68%	37 Missing and 16 partials ⚠️
src/easydiffraction/analysis/sequential.py	66.66%	6 Missing and 1 partial ⚠️
...c/easydiffraction/analysis/fit_helpers/tracking.py	95.60%	2 Missing and 2 partials ⚠️
src/easydiffraction/project/display.py	81.81%	2 Missing ⚠️
src/easydiffraction/display/tablers/pandas.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #173      +/-   ##
===========================================
+ Coverage    86.32%   86.37%   +0.04%     
===========================================
  Files          158      159       +1     
  Lines        12179    12451     +272     
  Branches      1400     1442      +42     
===========================================
+ Hits         10513    10754     +241     
- Misses        1155     1176      +21     
- Partials       511      521      +10     

Flag	Coverage Δ
integration	70.42% <63.83%> (-0.27%)	⬇️
unittests	78.35% <73.69%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/easydiffraction/analysis/analysis.py	90.75% <100.00%> (+3.75%)	⬆️
src/easydiffraction/display/plotters/plotly.py	83.00% <ø> (ø)
src/easydiffraction/display/plotting.py	71.99% <100.00%> (-0.04%)	⬇️
src/easydiffraction/display/tablers/base.py	94.59% <100.00%> (+0.30%)	⬆️
src/easydiffraction/display/tablers/rich.py	70.37% <100.00%> (-7.41%)	⬇️
src/easydiffraction/display/tables.py	79.66% <100.00%> (+2.73%)	⬆️
src/easydiffraction/utils/utils.py	96.12% <100.00%> (+0.06%)	⬆️
src/easydiffraction/display/tablers/pandas.py	67.64% <85.71%> (+4.15%)	⬆️
src/easydiffraction/project/display.py	72.38% <81.81%> (+0.40%)	⬆️
...c/easydiffraction/analysis/fit_helpers/tracking.py	93.91% <95.60%> (+3.81%)	⬆️
... and 2 more

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