maziggy f898556941 fix(a2l): transparent printer-card image + getPrinterImage resolver ...

Drop the off-white background on the A2L marketing render so it composites
  cleanly on the dark theme (every other printer image in public/img/printers/
  is RGBA with transparent corners; A2L shipped as opaque #F7F7F7). Resize to
  320x320 to match the rest of the artwork.

  Also wire A2L into getPrinterImage so the printer card actually shows the new
  artwork -- without this the resolver fell through to default.png for both
  the A2L display name and the N9 internal SSDP code.

  - frontend/public/img/printers/a2l.png: new, 320x320 RGBA, transparent
  - frontend/src/utils/printer.ts: A2L / N9 -> a2l.png, placed above the a1mini
    branch
  - frontend/src/__tests__/utils/printer.test.ts: 4 cases mirroring the X2D
    shape -- display name, case-insensitive variants, N9 internal code,
    regression guard against accidentally matching A2M / A1 / A1 Mini

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..

a1.png

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a1f.png

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a1mini.png

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a2l.png

fix(a2l): transparent printer-card image + getPrinterImage resolver

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default.png

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h2c.png

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h2d.png

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h2dpro.png

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o1c.png

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o1e.png

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o1s.png

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p1p.png

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p1s.png

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printer_placeholder.png

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x1c.png

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x1e.png

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x2d.png

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