Refactor plot_model_estimates functions to extract shared plotting logic

[Copilot]

The plot_model_estimates and plot_model_estimates! functions contained ~711 lines of duplicated plotting code. This refactoring extracts the common logic into a shared helper function following the pattern established by plot_solution.

Changes

• Added _plot_model_estimates_from_container helper function (637 lines)

  • Centralized plot generation from container data
  • Branches intelligently between single and comparison modes based on container length
  • Uses modular sub-functions instead of monolithic if/else blocks:
    • _generate_single_model_estimate_plots - handles single estimation plots
    • _generate_comparison_model_estimate_plots - handles comparison plots with annotations
    • Supporting helpers for legend creation, data overlay, and page assembly

• Simplified plot_model_estimates and plot_model_estimates!

  • Both now populate container and delegate to helper function
  • Removed 711 lines of duplicated plotting code
  • Replaced with 14-line helper invocations

Before/After

Before: Each function contained separate 173-line and 279-line plotting implementations

After:

push!(model_estimates_active_plot_container, args_and_kwargs)

return _plot_model_estimates_from_container(;
    show_plots = show_plots,
    save_plots = save_plots,
    # ... other plot options
    plot_attributes = plot_attributes)

Net impact: 47 fewer lines, single source of truth for plotting logic, easier maintenance of plot generation code.

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Original prompt

combine the code in the plot_model_estimates and plot_model_estimates! functions that are responsible for generating the plots from the plot_container. this has been done for plot_solution already and you can take inspirationf rom there. the goal is to move that part of the code into a function and have one function that can generate the plots for both functions. this should not be an giant if else statement for the length of the contianer but a combination that is a bit more elaborate, retains all the functionality, is readable and saves lines compared to the current situation

---

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.70533% with 237 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.87%. Comparing base (ffd714e) to head (aa62b83).

Files with missing lines	Patch %	Lines
ext/StatsPlotsExt.jl	25.70%	237 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ffd714e) and HEAD (aa62b83). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (ffd714e)	HEAD (aa62b83)
	20	15

Additional details and impacted files

@@                        Coverage Diff                         @@
##           copilot/improve-plotting-docs     #179       +/-   ##
==================================================================
- Coverage                          88.44%   67.87%   -20.58%     
==================================================================
  Files                                 20       20               
  Lines                              12421    12414        -7     
==================================================================
- Hits                               10986     8426     -2560     
- Misses                              1435     3988     +2553     

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