Fix ANSI color overflow in split-pane layout

[Copilot]

ANSI color codes from the detail panel were bleeding into the issue list because string truncation used len(), which counts escape sequences as characters rather than visual width.

Changes

• Import github.com/charmbracelet/x/ansi for visual width calculations
• Add padLineWithANSI() helper that uses ansi.StringWidth() and ansi.Truncate() for proper truncation/padding with ANSI awareness
• Update renderDetailPanel() to pad each line to exact visual width
• Update renderListPanel() to pad styled lines consistently

Technical Details

The issue occurs when combining lipgloss-styled text (which adds ANSI codes) with naive string truncation:

// Before: Incorrect - len() counts ANSI escape sequences
if len(line) > width {
    scrolledLines[i] = line[:width]  // May truncate mid-escape-sequence
}

// After: Correct - visual width calculation
func padLineWithANSI(s string, width int) string {
    visualWidth := ansi.StringWidth(s)
    if visualWidth >= width {
        return ansi.Truncate(s, width, "")
    }
    return s + strings.Repeat(" ", width-visualWidth)
}

This ensures panels maintain exact boundaries and handles Unicode properly (CJK characters, emojis, combining characters).

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