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feat: Line highlighting #35

@ikorich

Description

@ikorich

Summary

Highlight specific lines with background color to draw attention.

Motivation

Users want to emphasize particular lines of code in comparisons.

Implementation

  • Add line selection mode
  • Apply highlight background to selected lines
  • Configurable highlight color
  • Persist highlight state per panel

Files to Modify

  • CodePanel.swift - Track highlighted lines
  • CodeEditorView.swift - Render highlights
  • ToolBarView.swift - Highlight controls

Acceptance Criteria

  • Can select lines to highlight
  • Highlight visible in editor
  • Highlight appears in export
  • Clear highlights option

Story Points

3 points

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    3pt3 story pointsP3Low priorityenhancementNew feature or request

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