SIA feature parity tracking issue

[shamardy]

SIA minimal wallet and swaps implementation was completed in #2540 and added to GUI, this is an issue that tracks what is left to achieve feature parity with both the UTXO and EVM implementations:

• Use a sia-rust release once it's ready
• Replace hard‑coded Sia fees with configurable/dynamic fee estimation for wallet and swaps.
• Implement streaming events for SIA
• Add full HD wallet support for Sia (Ed25519 support in HD mod, multi‑account/multi‑address, HD address selection, HD balances) + support Ed25519 pubkeys in orderbooks and p2p messages.
• Implement tx history v2 for SIA and make sure unconfirmed transactions are in tx history.
• Implement message signing and verification for Sia to match other coins’ RPC surface.
• Fee burning if it's still needed.
• SIA Trezor implementation
• TPU implementation for SIA
• Watchers support
• External wallet support if there are any (like WalletConnect)

If anything is missing please add it to the above list.