fix(shell): use bigint to calculate vesting periods amount correctly

Author: olegshilov

libs/shell/services-pages/src/lib/create-vesting-account-page/create-vesting-account-page.tsx

@@ -343,8 +343,8 @@ function CreateVestingAccountForm() {
               placeholder="Deposit amount in ISLM"
               value={amount.toString()}
               onChange={(value) => {
-                const nextValue = !Number.isNaN(Number.parseInt(value))
-                  ? Number.parseInt(value)
+                const nextValue = !Number.isNaN(Number.parseFloat(value))
+                  ? Number.parseFloat(value)
                   : 0;
                 setAmount(nextValue);
               }}
@@ -488,7 +488,7 @@ function Input({
           required
           id={id}
           name={id}
-          value={value}
+          defaultValue={value}
           onChange={(event) => {
             onChange(event.currentTarget.value);
           }}

libs/shell/services-pages/src/lib/use-vesting-actions/use-vesting-actions.tsx

@@ -80,8 +80,9 @@ export function useVestingActions() {
       const periods = vestingInDays;
       const denom = 'aISLM';
       const lockupPeriods = [];
-      let restAmount = amount;
-      let unlockAmount = Math.floor(amount / periods);
+      const aislmAmount = BigInt(amount * 10 ** 18);
+      let restAmount = aislmAmount;
+      let unlockAmount = aislmAmount / BigInt(periods);
       let length: number = cliff;
 
       for (let i = 0; i < periods; i++) {
@@ -91,7 +92,7 @@ export function useVestingActions() {
 
         const unlockCoins = {
           denom: denom,
-          amount: BigInt(unlockAmount * 10 ** 18).toString(),
+          amount: unlockAmount.toString(),
         };
 
         const period = {