v0.5.4 - bug fix

Fixed

• Fixed image scaling behavior so zoom levels are now intuitive and consistent in the editor:
  • 1x, 2x, and 3x now behave as literal scale multipliers.
  • A separate dynamic Cover marker is shown so users can still reach full-card coverage when needed.
  • Slider marker alignment with the thumb was improved for clearer visual feedback.
• Fixed a rendering issue on small-treasure and large-treasure cards where thin left/right edge artifacts could appear at higher image zoom levels.

Root Cause

• Zoom labels previously mixed semantic targets with multiplier labels, which made scaling feel inconsistent.
• Slider tick placement used percentage-only positioning, which could drift from native thumb positioning.
• Textured border mask/texture assets (742x1045) were composited into a 750x1050 canvas using preserveAspectRatio="xMidYMid meet", which could leave narrow side gutters.

Change

• Updated zoom mapping so relative-mode slider values use literal multiplier behavior (1x -> 1, 2x -> 2, 3x -> 3).
• Added/retained dynamic max bounds so full-card coverage remains reachable, plus a separate Cover marker.
• Updated marker positioning to use pixel-based thumb-travel math for better alignment.
• Updated textured border rendering to use preserveAspectRatio="none" for both mask and texture layers, ensuring full edge coverage and preventing artwork bleed-through.

Impact

• More predictable zoom behavior across templates.
• Full-card coverage remains available.
• No schema/data migration changes.
• Legacy card compatibility behavior remains intact.

Validation

• Added/updated automated tests for zoom mapping behavior and marker positioning.
• Added regression coverage for CardTexturedBorder to ensure mask/texture fill mode remains correct.