fix(btc-only): hide 'Add EVM chain' on bitcoin-only firmware#349
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The dashboard chain list already restricts to Bitcoin on btc-only firmware (#347), but the '+ Add EVM chain' button + AddChainDialog were only gated by !watchOnly — so a BTConly device could still open the 177-chain EVM picker and add a network it physically can't touch. Gate the button with !btcOnly (its sole setShowAddChain trigger), so the dialog can't open.
This was referenced Jul 12, 2026
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Follow-up to #347/#348 (live btc-only device testing).
The chain list restricts to Bitcoin on btc-only firmware, but
+ Add EVM chainwas only gated by!watchOnly— a BTConly device could open the 177-chain EVM picker (see screenshot). Gate the button with!btcOnly(the solesetShowAddChaintrigger), so theAddChainDialogcan't open.Swap/ShapeShift intentionally stay — btc-only can still swap BTC via THORChain.