26.2: Merge pull request #402 from bcProFoundation/ui-styling-fixes

Add Shopping tab, fiat rate fallback, and performance optimizations by @nghiacc in #391
Handle missing XEC rates in API response with fiat currency fallback by @Copilot in #398
Support negative margin better Buy Sell branding and various other UI enhancements by @nghiacc in #402
feat: Fiat Rate API Fallback with Zero-Rate Detection and Telegram Notifications by @nghiacc in bcProFoundation/lixi#1178
Feat/fiat rate fallback and notifications, shopping and various bug fixes. by @nghiacc in bcProFoundation/lixi#1179

Full Changelog: 1.5.0...26.2