[WIP] The function aes_string() has been deprectaed and replaced

[Copilot]

Fix for deprecated aes_string() function

The function aes_string() has been deprecated in ggplot2 and needs to be replaced with the modern aes() syntax using the .data pronoun.

Completed Changes:

• Located all instances of aes_string() usage (3 instances in R/buildPlot.r)
• Analyzed the function parameters and data structure
• Determined the appropriate replacement strategy
• FIXED: Replaced aes_string(x=value, color="Model", shape="Model") with aes(x = .data[[value]], color = Model, shape = Model) on line 100
• FIXED: Replaced aes_string(x=value, y=coefficient) with aes(x = .data[[value]], y = .data[[coefficient]]) on line 114
• BONUS: Fixed related issue with quoted strings in aes() calls for geom_errorbarh (lines 85, 91)
• Verified no other files contain aes_string() usage

Remaining Tasks:

• Test the changes to ensure functionality is preserved
• Update documentation if needed

Technical Details:

• Used .data pronoun from rlang/dplyr for column name references from string parameters
• Used direct unquoted column references for literal column names like "Model" → Model
• Fixed related issues with incorrect quoted strings in existing aes() calls
• Only the commented-out aes_string() call remains (line 113), which is inactive code

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