Divided the app into components and rewrote JS to TS.

src/components/Child.vue

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+<script setup>
+const model = defineModel()
+</script>
+
+<template>
+  <span>My input</span> <input v-model="model">
+</template>

src/components/MainForm.vue

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+<script setup lang="ts">
+import VueDatePicker from '@vuepic/vue-datepicker';
+import type { Category, Contractor, OrderProduct } from '@/main';
+
+const props = defineProps(['isDarkTheme']);
+
+const uuid = defineModel<string>('orderUuid');
+const contractors = defineModel<Array<Contractor>>('contractors');
+const contractor = defineModel<number>('contractor');
+const deliveryDate = defineModel<Date>('deliveryDate');
+const categories = defineModel<Array<Category>>('categories');
+const showModal = defineModel<boolean>('showModal');
+
+
+function createJSON(event: Event) {
+  console.log(contractor.value);
+  event.preventDefault();
+  const json = {
+    MZN_UUID: uuid.value,
+    MZN_DataZam: new Date(Date.now()).toISOString(),
+    MZN_DataDos: deliveryDate.value != undefined ? deliveryDate.value.toISOString() : null,
+    MZN_PodID: contractor.value,
+    MZamElem: new Array<OrderProduct>
+  };
+
+  if(categories.value == undefined) return;
+
+  for (let category of categories.value) {
+    for (let product of category.Towary) {
+      if(product.Quantity != null) {
+        const productObject : OrderProduct = {
+          MZE_TwrId: product.Twr_TwrId,
+          MZE_TwrJm: product.ChosenOption,
+          MZE_TwrCena: product.ChosenOption == product.Twr_JMZ ? product.Twr_CenaZ : product.Twr_Cena,
+          MZE_TwrIlosc: product.Quantity.toString(),
+          MZE_TwrNazwa: product.Twr_Nazwa,
+          MZE_MZNID: undefined,
+          MZE_MZEID: undefined,
+          MZE_TwrStawka: undefined
+        };
+        json.MZamElem.push(productObject);
+      }
+    }
+  }
+  fetch('https://zamowienia.mleczarnia-kuzma.pl/api/zamowienie', {
+    method: 'POST',
+    headers: {
+      'Accept': 'application/json',
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify(json)
+  })
+    .then(response => response.json())
+    .then(response => uuid.value = response.MZN_UUID);
+}
+</script>
+
+<template>
+  <form class="box" @submit="createJSON">
+    <div class="mb-3">
+      <div class="box">
+        <h1 class="is-large mb-3"><b>ZAMÓWIENIE</b></h1>
+        <h1 class="is-large mb-3" v-if="uuid != null" ><b>{{ uuid }}</b></h1>
+        <div class="field mb-5">
+          <label class="label is-small">NIP</label>
+          <div class="field">
+            <div class="select is-small is-expanded" style="width: 100%">
+              <select v-model="contractor" class="is-expanded" style="width: 100%" required>
+                <option class="is-expanded" v-for="contractor in contractors" :key="contractor.Knt_KntId" :value=contractor.Knt_KntId>{{ contractor.Knt_NipE + ', ' + contractor.Knt_Miasto + ', ' + contractor.Knt_Nazwa1 + ' ' + contractor.Knt_Nazwa2 + ' ' + contractor.Knt_Nazwa3 }}</option>
+              </select>
+            </div>
+          </div>
+        </div>
+        <div class="field">
+          <label class="label is-small">Data dostawy</label>
+          <div class="field is-small">
+            <VueDatePicker class ="bulma-is-small is-static"
+                           v-model="deliveryDate"
+                           :enable-time-picker="false"
+                           :clearable="true"
+                           input-class-name="input is-small"
+                           v-bind:dark = "isDarkTheme"/>
+          </div>
+        </div>
+        <button class="button is-primary mt-5">Submit</button>
+        <button class="button is-primary mt-5 ml-3" @click="showModal = true">Potwierdź</button>
+      </div>
+    </div>
+    <div v-for="category in categories" :key="category.Kod">
+      <div class="box mb-3" >
+        <h1 class="is-large mb-3"><b>{{ category.Kod }}</b></h1>
+        <div class="field" v-for="(product, index) in category.Towary" :key="product.Twr_Nazwa">
+          <label class="label is-small">{{ product.Twr_Nazwa }}</label>
+          <div class="columns is-mobile">
+            <div class="column" v-if="product.ChosenOption == product.Twr_JM">
+              <div class="field">
+                <input
+                  class="input is-small"
+                  type="text"
+                  placeholder="Kwota"
+                  v-model="product.Twr_Cena"
+                />
+              </div>
+            </div>
+            <div class="column" v-else-if="product.ChosenOption == product.Twr_JMZ">
+              <div class="field">
+                <input
+                  class="input is-small"
+                  type="text"
+                  placeholder="Kwota"
+                  v-model="product.Twr_CenaZ"
+                />
+              </div>
+            </div>
+            <div class="column">
+              <div class="field has-addons">
+                <p class="control">
+                  <span class="select is-small">
+                    <select v-model="product.ChosenOption" readonly>
+                      <option v-for="option in product.Options" :key="option">{{ option }}</option>
+                    </select>
+                  </span>
+                </p>
+                <p class="control is-expanded">
+                  <input class="input is-small" type="text" placeholder="Ilość" v-model="product.Quantity">
+                </p>
+              </div>
+            </div>
+          </div>
+          <div v-if="!(index == category.Towary.length - 1)"></div>
+        </div>
+      </div>
+    </div>
+    <div class="columns mt-1 is-variable is-mobile">
+      <div class = "column is-6">
+        <button class="button is-primary is-fullwidth is-large">Submit</button>
+      </div>
+      <div class = "is-large column is-6 ml-3">
+        <button class="button is-primary is-fullwidth is-large" @click="parseOrderJSON">Potwierdź</button>
+      </div>
+    </div>
+  </form>
+</template>
+
+<style scoped>
+.dp__theme_dark {
+  --dp-background-color: rgb(20, 22, 26);
+}
+</style>

src/components/NavBar.vue

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+<script setup lang="ts">
+import { ref } from 'vue'
+
+const emit = defineEmits(['form', 'order']);
+
+const activator =  ref(false);
+
+function makeBurger() {
+  activator.value = !activator.value
+  return activator
+}
+
+function clickForm() {
+  emit('form');
+  if(activator.value) {
+    activator.value = false;
+  }
+}
+
+function clickOrders() {
+  emit('order');
+  if(activator.value) {
+    activator.value = false;
+  }
+}
+</script>
+
+<template>
+  <nav class="navbar" role="navigation" aria-label="main navigation">
+    <div class="navbar-brand">
+      <a class="navbar-item">
+        <h3 class="title is-3">Mleczarnia</h3>
+      </a>
+      <button @click="makeBurger" class="button navbar-burger" data-target="navMenu" v-bind:class="{ 'is-active': activator }">
+        <span aria-hidden="true"></span>
+        <span aria-hidden="true"></span>
+        <span aria-hidden="true"></span>
+        <span aria-hidden="true"></span>
+      </button>
+    </div>
+
+    <div class="navbar-menu" id="navMenu" v-bind:class="{ 'is-active': activator }">
+      <div class="navbar-start">
+        <a class="navbar-item" @click="clickForm">
+          Formularz
+        </a>
+
+        <a class="navbar-item" @click="clickOrders">
+          Zamówienia
+        </a>
+      </div>
+
+      <div class="navbar-end">
+        <div class="navbar-item">
+          <div class="buttons">
+            <a class="button is-light">
+              Log in
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  </nav>
+</template>
+
+<style scoped>
+
+</style>

src/components/OrdersSelector.vue

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+<script setup lang="ts">
+import VueDatePicker from '@vuepic/vue-datepicker';
+import {ref, watch} from 'vue'
+import type { Category, Order } from '@/main'
+
+const searchOrderDate = ref<Date>();
+const isOutOfBufor = ref<boolean>(false);
+const isInBufor = ref<boolean>(false);
+const orders = defineModel<Array<Order>>('orders');
+const uuid = defineModel<string>('uuid');
+const contractor = defineModel<number>('contractor');
+const deliveryDate = defineModel<Date>('deliveryDate');
+const categories = defineModel<Array<Category>>('categories');
+
+const emit = defineEmits(['order']);
+
+watch(isInBufor, (val) => {
+  if(val && val == isOutOfBufor.value) {
+    isOutOfBufor.value = false;
+  }
+},{
+  immediate: true
+});
+
+watch(isOutOfBufor, (val) => {
+  if(val && val == isInBufor.value) {
+    isInBufor.value = false;
+  }
+}, {
+  immediate: true
+});
+
+async function viewOrder(event: Event | undefined) {
+  console.log(event?.target?.name);
+  let tempOrder = orders.value?.find(order => (order.MZN_UUID == event?.target?.name));
+  console.log(tempOrder);
+  if (tempOrder == undefined) return;
+  if (categories.value == undefined) return;
+
+  const response = await fetch('https://zamowienia.mleczarnia-kuzma.pl/api/zamowienie/' + tempOrder.MZN_UUID);
+  let order = await response.json();
+
+  uuid.value = "test";
+  contractor.value = order.MZN_PodID;
+  deliveryDate.value = new Date(order.MZN_DataDos);
+  console.log(order);
+  for(let orderProduct of order.MZamElem){
+    for(let category of categories.value) {
+      let product = category.Towary.find(product => (product.Twr_TwrId == orderProduct.MZE_TwrId));
+      if(product != null) {
+        console.log('ten towar ' + product);
+        product.Twr_Cena = orderProduct.MZE_TwrCena.slice(0, -2);
+        product.Quantity = orderProduct.MZE_TwrIlosc.slice(0, -2);
+        break;
+      }
+    }
+  }
+  emit('order');
+  window.scrollTo(0, 0);
+}
+</script>
+
+<template>
+  <div class="box is-shadowless">
+    <form class="mb-3">
+      <div class="box">
+        <h1 class="is-large mb-3"><b>FILTR ZAMÓWIEŃ</b></h1>
+        <div class="field mb-5">
+          <label class="label is-small">Data zamówienia</label>
+          <div class="field is-small">
+            <VueDatePicker v-model="searchOrderDate"
+                           :enable-time-picker="false"
+                           :clearable="true"
+                           input-class-name="input is-small"/>
+          </div>
+        </div>
+        <div class="field mb-5">
+          <label class="label is-small">Zamówienie potwierdzone?</label>
+          <div class="control">
+            <label class="checkbox mr-5">
+              <input type="checkbox" v-model="isOutOfBufor"/>
+              Tak
+            </label>
+            <label class="checkbox">
+              <input type="checkbox" v-model="isInBufor"/>
+              Nie
+            </label>
+          </div>
+        </div>
+        <button class="button is-primary is-small is-expanded" @click="createJSON">Pobierz zamówienia</button>
+      </div>
+    </form>
+    <div class="box">
+      <h1 class="is-large mb-3"><b>ZAMÓWIENIA</b></h1>
+      <div class="columns is-multiline">
+        <div class="column is-4" v-for="order in orders" :key="order.MZN_UUID">
+          <div class="box">
+            <h1 class="mb-3 is-size-7"><b>{{ order.MZN_UUID }}</b></h1>
+            <label class="label is-small">Klient</label>
+            <div class="field is-small mb-3">
+              <input class="input is-small is-static"
+                     type="text"
+                     :value="order.MZN_PodNazwa1 + order.MZN_PodNazwa2 + order.MZN_PodNazwa3"
+                     readonly/>
+            </div>
+            <div class="columns is-mobile field is-small mb-0">
+              <div class="column is-6">
+                <label class="label is-small">Data dostawy</label>
+                <div class="field is-small">
+                  <input class="input is-small is-static"
+                         type="text"
+                         v-model="order.MZN_DataDos"
+                         readonly/>
+                </div>
+              </div>
+              <div class="column is-6">
+                <label class="label is-small">Data zamówienia</label>
+                <div class="field is-small">
+                  <input class="input is-small is-static"
+                         type="text"
+                         v-model="order.MZN_DataZam.split('T')[0]"
+                         readonly/>
+                </div>
+              </div>
+            </div>
+            <label class="label is-small">Zamówienie potwierdzone?</label>
+            <div class="field is-small mb-3" v-if="order.MZN_Bufor==0">
+              <input class="input is-small is-static"
+                     type="text"
+                     value="Tak"
+                     readonly/>
+            </div>
+            <div class="field is-small mb-3" v-else>
+              <input class="input is-small is-static"
+                     type="text"
+                     value="Nie"
+                     readonly/>
+            </div>
+            <button class="button is-primary is-small is-expanded" @click="viewOrder" :name="order.MZN_UUID">Podgląd</button>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+
+</style>