Home Screen hardware-wallet updates

[ovitrif]

Part of #998.

Scope

Implement the Home Screen hardware-wallet updates:

• Full-width device row below the Savings/Spending tiles: <device name> [conn-type indicator, green when connected] ₿ <balance>.
• Blue BTC icon and empty state ₿ 0.
• Include hardware funds in the headline total.
• Merge hardware device activity into the Home activity list.
• Add the HARDWARE / Connect device suggestion card in the carousel.
• Tapping the suggestion card opens the Connect Hardware flow.