[kastnerp]

💡 What: Extracted the final valid value of each plotted data series and appended it to the legend label in scientific notation (e.g. Ux (1.2e-04)). Handled Pandas duplicated column name behavior safely.
🎯 Why: In line plots with logarithmic scales and multiple overlapping traces (like convergence residuals), forcing users to visually trace the end of a line back to the Y-axis to estimate the final value is tedious and error-prone. This change provides precise, immediate context exactly where the user looks for identifying the line.
📸 Before/After: Before, legends showed just the field name (Ux, p). Now, they show Ux (1.2e-04), p (9.8e-05).
♿ Accessibility: Reduces the visual and cognitive load of interpreting dense, multi-line charts, especially on small screens or for users with vision or cognitive tracking impairments.

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PR created automatically by Jules for task 9999219480376186845 started by @kastnerp

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