add staking page

src/widgets/staking/ui/StakingWidget.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react'
 import { Notification } from '@shared/ui'
+import { truncateDecimals } from '@shared/lib/utils/truncateDecimals'
 import { ChainToggle } from './ChainToggle'
 import { StakeCard } from './StakeCard'
 import { PositionsPanel } from './PositionsPanel'
@@ -34,12 +35,16 @@ export function StakingWidget() {
     setAmount('')
   }
 
-  function handleStake() {
+  // stakeAmountHuman — это сумма стейка A (= введённое − газ), её и отправляем на бэкенд.
+  function handleStake(stakeAmountHuman: string) {
     stakeM.mutate(
-      { chain, amountHuman: amount },
+      { chain, amountHuman: stakeAmountHuman },
       {
         onSuccess: () => {
-          setToast({ status: 'success', message: `Стейкинг ${amount} ${CHAIN_META[chain].symbol} выполнен` })
+          setToast({
+            status: 'success',
+            message: `Стейкинг ${truncateDecimals(stakeAmountHuman, 6)} ${CHAIN_META[chain].symbol} выполнен`,
+          })
           setAmount('')
         },
         onError: (e) => setToast({ status: 'error', message: getStakingErrorMessage(e) }),