Bridge: add retry on origin failure, dedupe fee constant

Retry: OriginFailed only offered "Done" (start over from the input
screen) - the origin transfer never left the wallet in that state, so
retrying is just re-running submit() from scratch, same as Swap's own
retryClicked(). The execution screen's action button now shows "Try
again"/retries when OriginFailed, "Done" otherwise - derived from the
same state observer already driving the alert banner, not a second
LiveData to keep in sync.

FEE_PERCENT was duplicated as separate 0.001 literals in BridgeViewModel
and BridgeExecutionViewModel. Moved to BridgeMultisigConstants (already
the shared home for this feature's cross-cutting constants) so there's
one number to change if the server-side fee_basis_points ever does.

Deliberately NOT touching the deeper architecture items (LiveData vs
StateFlow, extracting submit logic to a domain interactor) - Bridge's
sealed BridgeExecutionState already gives it the single-source-of-truth
property that motivated Swap's StateFlow design, and its submit/wait
logic isn't shared with any other screen, so there's no duplication or
desync bug those changes would actually fix here. This scope is staying
USDT.p<->USDT only going forward (other bridge/swap pairs route through
the separate pezsnowbridge DApp) - the real trigger for that refactor
(a second bridge pair reusing this logic) will not happen in this
screen, so it's not deferred tech debt, it's a closed decision.

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/domain/bridge/multisig/BridgeMultisigConstants.kt

@@ -44,6 +44,11 @@ object BridgeMultisigConstants {
 
     const val THRESHOLD = 3
 
+    /** Single source of truth for the bridge fee - was previously duplicated as separate literals
+     *  in BridgeViewModel and BridgeExecutionViewModel, both computing the same 1:1-minus-fee
+     *  output. Must match usdt-bridge's own `fee_basis_points` (10 = 0.1%) server-side. */
+    const val FEE_PERCENT = 0.001
+
     /** Hard per-transaction ceiling the automation key may ever execute on its own, regardless of
      *  how much on-chain approval remains - must match usdt-bridge's own `max_single_tx`
      *  (default_max_single_tx() in bridge_config.json). A single withdrawal/deposit above this is

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/BridgeViewModel.kt

@@ -69,7 +69,6 @@ class BridgeViewModel(
         const val POLKADOT_USDT_ASSET_ID = 1 // assetId in chains.json for Polkadot AH
         const val PEZKUWI_USDT_ASSET_ID = 1000 // assetId in chains.json for Pezkuwi AH
 
-        const val FEE_PERCENT = 0.001
         const val MIN_USDT = 1.0
 
         // USDT has 6 decimals on both Polkadot and Pezkuwi Asset Hub.
@@ -409,7 +408,7 @@ class BridgeViewModel(
     }
 
     private fun calculateOutput() {
-        val netOutput = currentAmount * (1 - FEE_PERCENT) // 1:1, fee-adjusted
+        val netOutput = currentAmount * (1 - BridgeMultisigConstants.FEE_PERCENT) // 1:1, fee-adjusted
 
         _outputAmount.value = if (netOutput > 0) {
             BigDecimal(netOutput).setScale(6, RoundingMode.DOWN).stripTrailingZeros().toPlainString()

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/execution/BridgeExecutionFragment.kt

@@ -33,8 +33,6 @@ class BridgeExecutionFragment : BaseFragment<BridgeExecutionViewModel, FragmentB
 
         binder.bridgeExecutionToolbar.setHomeButtonVisibility(false)
 
-        binder.bridgeExecutionDoneButton.setOnClickListener { viewModel.doneClicked() }
-
         binder.bridgeExecutionFromCard.setEditable(false)
         binder.bridgeExecutionToCard.setEditable(false)
     }
@@ -93,20 +91,32 @@ class BridgeExecutionFragment : BaseFragment<BridgeExecutionViewModel, FragmentB
         // Single source of truth for the alert banner - only OriginFailed (error) and
         // DestinationPendingReview (warning) show it, everything else keeps it hidden. Avoids the
         // old screen's problem of several independent LiveData all touching the same view.
+        //
+        // Also the single source of truth for the action button's label/click target: only
+        // OriginFailed offers a real retry (the origin transfer never left the wallet, so
+        // re-running submit() from scratch is safe and matches SwapExecutionFragment's
+        // "Try again" pattern) - every other resolved state means something already happened
+        // on-chain, so the button can only ever mean "Done".
         viewModel.state.observe { state ->
             when (state) {
                 is BridgeExecutionState.OriginFailed -> {
                     binder.bridgeExecutionPendingReviewAlert.visibility = View.VISIBLE
                     binder.bridgeExecutionPendingReviewAlert.setStylePreset(AlertView.StylePreset.ERROR)
                     binder.bridgeExecutionPendingReviewAlert.setMessage(state.message)
+                    binder.bridgeExecutionDoneButton.setText(R.string.common_try_again)
+                    binder.bridgeExecutionDoneButton.setOnClickListener { viewModel.retryClicked() }
                 }
                 BridgeExecutionState.DestinationPendingReview, BridgeExecutionState.AwaitingManualReview -> {
                     binder.bridgeExecutionPendingReviewAlert.visibility = View.VISIBLE
                     binder.bridgeExecutionPendingReviewAlert.setStylePreset(AlertView.StylePreset.WARNING)
                     binder.bridgeExecutionPendingReviewAlert.setMessage(getString(R.string.bridge_deposit_pending_message))
+                    binder.bridgeExecutionDoneButton.setText(R.string.common_done)
+                    binder.bridgeExecutionDoneButton.setOnClickListener { viewModel.doneClicked() }
                 }
                 else -> {
                     binder.bridgeExecutionPendingReviewAlert.visibility = View.GONE
+                    binder.bridgeExecutionDoneButton.setText(R.string.common_done)
+                    binder.bridgeExecutionDoneButton.setOnClickListener { viewModel.doneClicked() }
                 }
             }
         }

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/execution/BridgeExecutionViewModel.kt

@@ -12,6 +12,7 @@ import io.novafoundation.nova.feature_account_api.domain.interfaces.SelectedAcco
 import io.novafoundation.nova.feature_account_api.presenatation.chain.getAssetIconOrFallback
 import io.novafoundation.nova.feature_assets.R
 import io.novafoundation.nova.feature_assets.domain.WalletInteractor
+import io.novafoundation.nova.feature_assets.domain.bridge.multisig.BridgeMultisigConstants
 import io.novafoundation.nova.feature_assets.domain.send.SendInteractor
 import io.novafoundation.nova.feature_assets.presentation.AssetsRouter
 import io.novafoundation.nova.feature_assets.presentation.bridge.BridgeAssetCardUi
@@ -57,8 +58,6 @@ class BridgeExecutionViewModel(
         /** How long to actively watch the destination balance before admitting we can't confirm
          *  completion yet - not a claim about how long the bridge itself actually takes. */
         val DEPOSIT_WAIT_TIMEOUT = 90.seconds
-
-        const val FEE_PERCENT = 0.001
     }
 
     private val _state = MutableLiveData<BridgeExecutionState>(BridgeExecutionState.SubmittingOrigin)
@@ -98,6 +97,15 @@ class BridgeExecutionViewModel(
         router.back()
     }
 
+    /** Only meaningful from OriginFailed - the origin transfer never left the wallet (nothing to
+     *  reverse), so retrying is just re-running submit() from scratch, matching what the user
+     *  already confirmed on the input screen. Mirrors SwapExecutionViewModel.retryClicked(). */
+    fun retryClicked() {
+        launch {
+            submit()
+        }
+    }
+
     private suspend fun loadCards() {
         val originChain = chainRegistry.getChain(payload.originChainId)
         val destChain = chainRegistry.getChain(payload.destChainId)
@@ -107,7 +115,7 @@ class BridgeExecutionViewModel(
 
         _fromAmountText.postValue(BigDecimal.valueOf(payload.amount).stripTrailingZeros().toPlainString())
 
-        val netOutput = payload.amount * (1 - FEE_PERCENT)
+        val netOutput = payload.amount * (1 - BridgeMultisigConstants.FEE_PERCENT)
         _toAmountText.postValue(BigDecimal(netOutput).setScale(6, RoundingMode.DOWN).stripTrailingZeros().toPlainString())
     }
 
@@ -211,7 +219,7 @@ class BridgeExecutionViewModel(
         _label.postValue(resourceManager.getString(R.string.bridge_execution_waiting_destination_label, destChainName))
         _timerState.postValue(ExecutionTimerView.State.CountdownTimer(DEPOSIT_WAIT_TIMEOUT))
 
-        val minExpectedIncrease = BigDecimal.valueOf(payload.amount * (1 - FEE_PERCENT * 2)) // fee + rounding slack
+        val minExpectedIncrease = BigDecimal.valueOf(payload.amount * (1 - BridgeMultisigConstants.FEE_PERCENT * 2)) // fee + rounding slack
 
         val confirmed = withTimeoutOrNull(DEPOSIT_WAIT_TIMEOUT.inWholeMilliseconds) {
             walletInteractor.assetFlow(payload.destChainId, payload.destAssetId)