test(card): loadMarkImage mit Stubs testen, Verweise prüfen, Amex-Umriss freistellen

loadMarkImage: Cache je (id, tone), eingefärbter Blob mit eigener Größe,
Freigabe der Blob-URL bei load und error, erneuter Versuch nach Fehler.
Neuer Test: jedes url(#...) zeigt auf eine id derselben SVG-Datei.
amex-outline: Rahmen nach außen verschoben, berührt "A" und "S" nicht mehr.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/assets/marks/amex-outline.svg

@@ -1 +1 @@
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