feat(card): Netzwerk- und Marken-Logos

18 Netzwerk-Logos, AirCards-Symbol/-Text und Apple als bereinigte SVGs
(Wikimedia Commons, gemeinfrei; abgeleitete Varianten selbst gebaut),
Register marks.ts mit Einfärben (currentColor) und Bild-Lader sowie
festfarbiges Favicon.

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

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

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