fix: fixed truncation issue for long help text (#29269)

This PR aims to fix the truncation issue in send flow. The decimal value
in error message used to show all the decimal numbers after decimal.
This PR updates the max value to be shown after decimals to be 4 which
is also the standard decimal value we try to show in other places of
code

## **Related issues**

Fixes: #26766 

## **Manual testing steps**

1. Go to Send Flow
2. Try sending a token with large input than the available balance
3. Check the value in helptext doesn't overlap and only shows 4 numbers

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**
![Screenshot 2024-12-17 at 11 17
19 AM](https://github.com/user-attachments/assets/8f9e39ba-60a6-4cd9-88f3-c7e56aa14e1c)


### **After**

![Screenshot 2024-12-17 at 11 18
05 AM](https://github.com/user-attachments/assets/08a6913e-13a1-40ad-bd48-ae8528412287)

## **Pre-merge author checklist**

- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

ui/components/multichain/asset-picker-amount/asset-balance/asset-balance-text.tsx

@@ -48,6 +48,10 @@ export function AssetBalanceText({
   const balanceString =
     hexToDecimal(asset.balance) || tokensWithBalances[0]?.string;
 
+  const showFixedBalanceString = balanceString?.includes('.')
+    ? balanceString.slice(0, balanceString.indexOf('.') + 5) // Include 4 digits after the decimal
+    : balanceString;
+
   const balanceValue = useSelector(getSelectedAccountCachedBalance);
 
   const nativeTokenFiatBalance = useCurrencyDisplay(balanceValue, {
@@ -135,7 +139,7 @@ export function AssetBalanceText({
     return (
       <UserPreferencedCurrencyDisplay
         {...commonProps}
-        displayValue={`${balanceString || ''}${errorText}`}
+        displayValue={`${showFixedBalanceString || ''}${errorText}`}
       />
     );
   }