Merge pull request #5676 from mempool/mononaut/balance-chart-ticks

Fix fiat tick precision on address balance chart

frontend/src/app/shared/pipes/amount-shortener.pipe.ts

@@ -8,8 +8,12 @@ export class AmountShortenerPipe implements PipeTransform {
     const digits = args[0] ?? 1;
     const unit = args[1] || undefined;
     const isMoney = args[2] || false;
+    const sigfigs = args[3] || false; // if true, "digits" is the number of significant digits, not the number of decimal places
 
     if (num < 1000) {
+      if (sigfigs) {
+        return Number(num.toPrecision(digits));
+      }
       return num.toFixed(digits);
     }
 
@@ -25,10 +29,15 @@ export class AmountShortenerPipe implements PipeTransform {
     const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
     const item = lookup.slice().reverse().find((item) => num >= item.value);
 
-    if (unit !== undefined) {
-      return item ? (num / item.value).toFixed(digits).replace(rx, '$1') + ' ' + item.symbol + unit : '0';
-    } else {
-      return item ? (num / item.value).toFixed(digits).replace(rx, '$1') + item.symbol : '0';
+    if (!item) {
+      return '0';
     }
+
+    const scaledNum = num / item.value;
+    const formattedNum = Number(sigfigs ? scaledNum.toPrecision(digits) : scaledNum.toFixed(digits)).toString();
+
+    return unit !== undefined
+      ? formattedNum + ' ' + item.symbol + unit
+      : formattedNum + item.symbol;
   }
 }