Mobile improvements and changes to network selector.

[Randy808]

, added border to network selector, and added percentage delta to bitcoin price chart.

To run locally, npm install and use the following snippets:

# Bitcoin
export API_URL=https://blockstream.info/api
export PORT=4999
source flavors/blockstream/config.env
source flavors/bitcoin-mainnet/config.env
npm run dev-server

# Liquid
export API_URL=https://blockstream.info/liquid/api
export PORT=5000
source flavors/blockstream/config.env
source flavors/liquid-mainnet/config.env
npm run dev-server

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• Moved 'live' status badge on separate line on mobile

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• Retained desktop layout for pending block on mobile

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• Added price delta percentage

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• Removed latest transactions table header on mobile

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• Stacked fee on feerate on smaller screens

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• Added border to network selector