Android WebView often failed the official Penpot SVG: root fill=none
and wordmark paths only inherited black from a parent <g>, so the blue
T showed without the "taler" letters. Serve taler-assets qr-logo.png,
keep fixed SVG as fallback, explicit logo size/alt.
Wallet hub rows on bank, exchange, and merchant landings used vague mono
icons that were hard to tell apart.
Replace them with multi-colour brand-style marks for Chrome, Firefox, Edge,
and Brave. Hub label becomes “Web browsers (experimental)”.
Also drop the circled “①” prefix from the shop pay popup “Wallet payment”
label — leftover copy-paste artefact from an earlier draft, not intentional
numbering.
