Redesign color swatch in theme picker

[cyanzhong]

No description provided.

[Copilot]

🟢 Approval recommended

Only a minor, non-blocking swatch-width nit remains.

Pull request overview

Redesigns built-in theme picker swatches with pill-shaped backgrounds, circular color indicators, and updated palettes.

Changes:

• Updates swatch rendering and sizing.
• Adjusts dark-theme presentation.
• Expands built-in theme palettes.

File summaries

File	Summary
MarkEditMac/Sources/Main/AppTheme.swift	Updates swatch rendering and theme palettes.

Review details

Suppressed comments (1)

MarkEditMac/Sources/Main/AppTheme.swift:46

• The drawing handler paints the pill only through backgroundRect, whose width is size.width, but the image is allocated 4 points wider. This leaves a transparent strip on the right of every picker swatch and makes the visible pill asymmetrically padded; allocate the image at size unless that extra margin is also drawn intentionally.

    return NSImage(size: CGSize(width: size.width + 4, height: size.height), flipped: false) { _ in

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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