Merge branch 'feature/btc-native-send' into fix/multisig-first-signer-deep-link

# Conflicts:
#	feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/BridgeFragment.kt
#	feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/BridgeViewModel.kt
#	feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/di/BridgeModule.kt

feature-account-api/src/main/java/io/novafoundation/nova/feature_account_api/data/model/Fee.kt

@@ -63,6 +63,31 @@ class SubstrateFee(
     override val asset: Chain.Asset
 ) : Fee
 
+/**
+ * Fee for a Bitcoin transaction, denominated in sats: `feeRate (sat/vB) * estimated vsize` - see
+ * `RealBitcoinTransactionService` for how both are derived. The network only ever collects what miners include
+ * in a block, which is exactly this amount (unlike account-model chains, a Bitcoin fee is not a cap/estimate
+ * that gets partially refunded - it is the literal difference between input and output values).
+ */
+class BitcoinFee(
+    override val amount: BigInteger,
+    override val submissionOrigin: SubmissionOrigin,
+    override val asset: Chain.Asset
+) : Fee
+
+/**
+ * Fee for a Tron transaction (native TRX or TRC-20), always denominated in TRX (sun), regardless of which asset
+ * is being sent - Tron has no separate "gas token" concept, network resources (bandwidth/energy) are always
+ * burned as TRX. [amount] is this client's own estimate of that burn (see `RealTronTransactionService`); the
+ * network only ever burns what it actually uses, so the real cost can be lower, but never higher than what this
+ * client authorized via `fee_limit` when submitting.
+ */
+class TronFee(
+    override val amount: BigInteger,
+    override val submissionOrigin: SubmissionOrigin,
+    override val asset: Chain.Asset
+) : Fee
+
 class SubstrateFeeBase(
     override val amount: BigInteger,
     override val asset: Chain.Asset

feature-account-api/src/main/java/io/novafoundation/nova/feature_account_api/data/secrets/SecretStoreExt.kt

@@ -25,14 +25,14 @@ suspend fun SecretStoreV2.getAccountSecrets(
 
 fun AccountSecrets.keypair(chain: Chain): Keypair {
     return fold(
-        left = { mapMetaAccountSecretsToKeypair(it, ethereum = chain.isEthereumBased) },
+        left = { mapMetaAccountSecretsToKeypair(it, ethereum = chain.isEthereumBased, bitcoin = chain.isBitcoinBased) },
         right = { mapChainAccountSecretsToKeypair(it) }
     )
 }
 
 fun AccountSecrets.derivationPath(chain: Chain): String? {
     return fold(
-        left = { mapMetaAccountSecretsToDerivationPath(it, ethereum = chain.isEthereumBased) },
+        left = { mapMetaAccountSecretsToDerivationPath(it, ethereum = chain.isEthereumBased, bitcoin = chain.isBitcoinBased) },
         right = { it[ChainAccountSecrets.DerivationPath] }
     )
 }

feature-account-api/src/main/java/io/novafoundation/nova/feature_account_api/domain/model/MetaAccount.kt

@@ -52,6 +52,10 @@ interface LightMetaAccount {
      */
     val tronAddress: ByteArray?
     val tronPublicKey: ByteArray?
+
+    /** Bitcoin account id (HASH160 of the compressed pubkey - see [io.novafoundation.nova.common.utils.hash160]). */
+    val bitcoinAddress: ByteArray?
+    val bitcoinPublicKey: ByteArray?
     val isSelected: Boolean
     val name: String
     val type: Type
@@ -90,6 +94,8 @@ fun LightMetaAccount(
     parentMetaId: Long?,
     tronAddress: ByteArray? = null,
     tronPublicKey: ByteArray? = null,
+    bitcoinAddress: ByteArray? = null,
+    bitcoinPublicKey: ByteArray? = null,
 ) = object : LightMetaAccount {
     override val id: Long = id
     override val globallyUniqueId: String = globallyUniqueId
@@ -100,6 +106,8 @@ fun LightMetaAccount(
     override val ethereumPublicKey: ByteArray? = ethereumPublicKey
     override val tronAddress: ByteArray? = tronAddress
     override val tronPublicKey: ByteArray? = tronPublicKey
+    override val bitcoinAddress: ByteArray? = bitcoinAddress
+    override val bitcoinPublicKey: ByteArray? = bitcoinPublicKey
     override val isSelected: Boolean = isSelected
     override val name: String = name
     override val type: LightMetaAccount.Type = type