Refactor/composables-folder (#787)

* move api clients and rename

* organize recipes composables

* rewrite useRecipeContext

* refactor(frontend): ♻️ abstract common ingredient functionality.

* feat(frontend): ✨ add scale, and back to recipe button + hide ingredients if none

* update regex to mach 11. instead of just 1.

* minor UX improvements

Co-authored-by: Hayden K <hay-kot@pm.me>

frontend/composables/recipes/use-fraction.ts

@@ -0,0 +1,76 @@
+/* frac.js (C) 2012-present SheetJS -- http://sheetjs.com */
+/* https://developer.aliyun.com/mirror/npm/package/frac/v/0.3.0 Apache license */
+
+function frac(x: number, D: number, mixed: Boolean) {
+  let n1 = Math.floor(x);
+  let d1 = 1;
+  let n2 = n1 + 1;
+  let d2 = 1;
+  if (x !== n1)
+    while (d1 <= D && d2 <= D) {
+      const m = (n1 + n2) / (d1 + d2);
+      if (x === m) {
+        if (d1 + d2 <= D) {
+          d1 += d2;
+          n1 += n2;
+          d2 = D + 1;
+        } else if (d1 > d2) d2 = D + 1;
+        else d1 = D + 1;
+        break;
+      } else if (x < m) {
+        n2 = n1 + n2;
+        d2 = d1 + d2;
+      } else {
+        n1 = n1 + n2;
+        d1 = d1 + d2;
+      }
+    }
+  if (d1 > D) {
+    d1 = d2;
+    n1 = n2;
+  }
+  if (!mixed) return [0, n1, d1];
+  const q = Math.floor(n1 / d1);
+  return [q, n1 - q * d1, d1];
+}
+function cont(x: number, D: number, mixed: Boolean) {
+  const sgn = x < 0 ? -1 : 1;
+  let B = x * sgn;
+  let P_2 = 0;
+  let P_1 = 1;
+  let P = 0;
+  let Q_2 = 1;
+  let Q_1 = 0;
+  let Q = 0;
+  let A = Math.floor(B);
+  while (Q_1 < D) {
+    A = Math.floor(B);
+    P = A * P_1 + P_2;
+    Q = A * Q_1 + Q_2;
+    if (B - A < 0.00000005) break;
+    B = 1 / (B - A);
+    P_2 = P_1;
+    P_1 = P;
+    Q_2 = Q_1;
+    Q_1 = Q;
+  }
+  if (Q > D) {
+    if (Q_1 > D) {
+      Q = Q_2;
+      P = P_2;
+    } else {
+      Q = Q_1;
+      P = P_1;
+    }
+  }
+  if (!mixed) return [0, sgn * P, Q];
+  const q = Math.floor((sgn * P) / Q);
+  return [q, sgn * P - q * Q, Q];
+}
+
+export const useFraction = function () {
+  return {
+    frac,
+    cont,
+  };
+};