add check for two decimals and fix showing error for fiat tip

ui/component/walletSendTip/view.jsx

@@ -186,8 +186,7 @@ function WalletSendTip(props: Props) {
 
   React.useEffect(() => {
     // Regex for number up to 8 decimal places
-    const regexp = RegExp(/^(\d*([.]\d{0,8})?)$/);
+    let regexp;
-    const validTipInput = regexp.test(String(tipAmount));
     let tipError;
 
     if (tipAmount === 0) {
@@ -198,8 +197,13 @@ function WalletSendTip(props: Props) {
 
     // if it's not fiat, aka it's boost or lbc tip
     else if (activeTab !== TAB_FIAT) {
+      regexp = RegExp(/^(\d*([.]\d{0,8})?)$/);
+      const validTipInput = regexp.test(String(tipAmount));
+
       if (!validTipInput) {
         tipError = __('Amount must have no more than 8 decimal places');
+      } else if (!validTipInput) {
+        tipError = __('Amount must have no more than 8 decimal places');
       } else if (tipAmount === balance) {
         tipError = __('Please decrease the amount to account for transaction fees');
       } else if (tipAmount > balance) {
@@ -209,7 +213,12 @@ function WalletSendTip(props: Props) {
       }
     //  if tip fiat tab
     } else {
-      if (tipAmount < 1) {
+      regexp = RegExp(/^(\d*([.]\d{0,2})?)$/);
+      const validTipInput = regexp.test(String(tipAmount));
+
+      if (!validTipInput) {
+        tipError = __('Amount must have no more than 2 decimal places');
+      } else if (tipAmount < 1) {
         tipError = __('Amount must be at least one dollar');
       } else if (tipAmount > 1000) {
         tipError = __('Amount cannot be over 1000 dollars');
@@ -544,7 +553,7 @@ function WalletSendTip(props: Props) {
                         </React.Fragment>
                       }
                       className="form-field--price-amount"
-                      error={tipError && activeTab !== TAB_FIAT}
+                      error={tipError}
                       min="0"
                       step="any"
                       type="number"

ui/component/walletTipAmountSelector/view.jsx

@@ -120,9 +120,7 @@ function WalletTipAmountSelector(props: Props) {
     // setHasSavedCard(false);
     // setCanReceiveFiatTip(true);
 
-    const regexp = RegExp(/^(\d*([.]\d{0,8})?)$/);
+    let regexp, tipError;
-    const validTipInput = regexp.test(String(amount));
-    let tipError = '';
 
     if (amount === 0) {
       tipError = __('Amount must be a positive number');
@@ -132,6 +130,9 @@ function WalletTipAmountSelector(props: Props) {
 
     // if it's not fiat, aka it's boost or lbc tip
     else if (activeTab !== TAB_FIAT) {
+      regexp = RegExp(/^(\d*([.]\d{0,8})?)$/);
+      const validTipInput = regexp.test(String(amount));
+
       if (!validTipInput) {
         tipError = __('Amount must have no more than 8 decimal places');
       } else if (amount === balance) {
@@ -143,7 +144,12 @@ function WalletTipAmountSelector(props: Props) {
       }
       //  if tip fiat tab
     } else {
-      if (amount < 1) {
+      regexp = RegExp(/^(\d*([.]\d{0,2})?)$/);
+      const validTipInput = regexp.test(String(amount));
+
+      if (!validTipInput) {
+        tipError = __('Amount must have no more than 2 decimal places');
+      } else if (amount < 1) {
         tipError = __('Amount must be at least one dollar');
       } else if (amount > 1000) {
         tipError = __('Amount cannot be over 1000 dollars');
@@ -154,8 +160,10 @@ function WalletTipAmountSelector(props: Props) {
     onTipErrorChange(tipError);
   }, [amount, balance, setTipError, activeTab]);
 
+  // parse number as float and sets it in the parent component
   function handleCustomPriceChange(amount: number) {
     const tipAmount = parseFloat(amount);
+
     onChange(tipAmount);
   }
 
@@ -229,6 +237,7 @@ function WalletTipAmountSelector(props: Props) {
         </>
       )}
 
+      {/* custom number input form */}
       {useCustomTip && (
         <div className="comment__tip-input">
           <FormField