Improve retro card style

[austin-smith]

What Changed

• Reworked pixel cards around a display-aligned SwiftUI grid with crisp stepped chrome, face beveling, and a detailed woven card back.
• Replaced the court-card presentation with seamless two-way Jack, Queen, and King sprites using suit-dominant red/black garments, opposing sashes, and consistent navy accents.
• Standardized pip geometry and card-style preview sizing.
• Added regression coverage for pixel alignment, pip placement, royal symmetry, sash geometry, and shared accent masks.

Why

The retro style had soft or inconsistent pixel geometry and court-card artwork that lacked a coherent shared visual system. These changes make the style crisp at responsive sizes while keeping the court figures distinct and consistent.

UI Changes

Pixel cards now use display-aligned edges, stronger stepped chrome, a centered back medallion, even pip geometry, and polished two-way court figures. Classic and Simple card styles are unchanged.

Validation

• macOS test suite: 579 tests passed, 10 skipped, 0 failures.
• git diff --check origin/main...HEAD

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