For transactions with no brand match, show the spending category emoji
(Twitter Twemoji SVG via jsDelivr) instead of a bare initial:
Groceries 🛒 Food 🍔 Fuel ⛽ Health 💊 Subscriptions 💻
Shopping 🛍 Utilities 💡 Cash 🏧 Debt 💳 Wallets 📱 Fees 🏦
Income/transfer rows use flow-type icons (💰 income, 🔁 self-transfer).
Resolution chain: Brandfetch brand logo -> category Twemoji -> coloured
initial. Brand logo onerror also falls back to the category emoji.
Call sites pass {category} (merchants/breakdown) or {flowType} (ledger).
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