Host fonts locally and guard FOUC

hdyc-svelte/src/lib/components/Calculator.svelte

@@ -14,8 +14,6 @@
   let val2 = '';
   let val3 = '';
   let activeField: 1 | 2 | 3 = 1;
-  let swapSnapshot: { val1: string; val2: string } | null = null;
-  let isSwapFlipped = false;
 
   $: has3 = ['3col', '3col-mul'].includes(config.type) || !!config.labels.in3;
   $: isTextInput = ['base', 'text-bin', 'bin-text', 'dec-frac', 'dms-dd', 'dd-dms'].includes(config.type);
@@ -27,13 +25,7 @@
 
   let paramsInitializing = true;
 
-  function resetSwapState() {
-    swapSnapshot = null;
-    isSwapFlipped = false;
-  }
-
   function handleInput(source: 1 | 2 | 3) {
-    resetSwapState();
     activeField = source;
     const result = solve(config, source, val1, val2, val3);
     if (source !== 1) val1 = result.val1;
@@ -42,23 +34,14 @@
   }
 
   function swap() {
-    if (isSwapFlipped && swapSnapshot) {
-      val1 = swapSnapshot.val1;
-      val2 = swapSnapshot.val2;
-      resetSwapState();
-    } else {
-      swapSnapshot = { val1, val2 };
-      [val1, val2] = [val2, val1];
-      isSwapFlipped = true;
-    }
-    activeField = activeField === 1 ? 2 : 1;
+    const nextSource: 1 | 2 = activeField === 1 ? 2 : 1;
+    handleInput(nextSource);
   }
 
   function clear() {
     val1 = '';
     val2 = '';
     val3 = '';
-    resetSwapState();
   }
 
   onMount(() => {