Изменена архитектура проекта, проправлены инпорты и синтаксис html для pug

src/components/theComponents/TheHeader.vue

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+<template lang="pug">
+  .header-wrapper
+    .header-left-side
+      img.logo-img(src="@/assets/images/logo.svg" alt="Logo")
+    .header-right-side
+      .header-inputs-wrapper
+        img.search-icon(src="@/assets/icons/search.svg" alt="Search")
+        select.header-inputs.select(v-model="selectedFilter")
+          option(v-for="filter in filters" :key="filter" :value="filter") {{ filter }}
+        span.header-inputs-separator
+        input.header-inputs.search-input(placeholder="Искать ...")
+      button.header-buttons.btn-notification
+        img.bell-icon(src="@/assets/icons/bell.svg" alt="Notifications")
+      .avatar-wrapper
+        img.avatar-img(:src="avatarSrc")
+        button.header-buttons.btn-down-arrow
+          img.arrow-icon(src="@/assets/icons/down-arrow-2.svg" alt="Down Arrow")
+</template>
+
+<script>
+  import img from '@/assets/images/avatar.svg'
+  export default {
+    name: 'HeaderComponent',
+    data() {
+      return {
+        selectedFilter: 'Календарь',
+        filters: ['Календарь', 'Вариант 2', 'Вариант 3'],
+        avatarSrc: img
+      }
+    }
+  }
+</script>
+
+<style lang='sass'>
+  input
+    padding: 0
+
+  .header-buttons
+    outline: none
+    border: none
+    background-color: transparent
+    cursor: pointer
+    padding: 0
+    color: var(--font-dark-blue-color)
+
+  .header-wrapper
+    display: flex
+    flex-direction: row
+    justify-content: space-between
+    width: 100%
+    padding: 8px 24px
+    background-color: var(--bg-white-color)
+    box-sizing: border-box
+
+  .header-right-side
+    display: flex
+    flex-direction: row
+
+  .header-left-side
+    box-sizing: border-box
+    margin: 4px 0
+    height: 32px
+    cursor: pointer
+
+  .logo-img
+    height: 32px
+    width: 70px
+
+  .header-inputs-wrapper
+    display: inline-block
+    background-color: rgba(65, 105, 225, 0.1)
+    padding: 8px 18px 8px 16px
+    border-radius: 4px
+    margin-right: 46px
+
+  .search-icon
+    position: absolute
+    height: 24px
+    width: 24px
+    color: var(--btn-blue-color)
+    opacity: 0.7
+
+  .btn-notification
+    display: flex
+    justify-content: center
+    align-items: center
+    margin-right: 32px
+
+  .arrow-icon
+    width: 24px
+    height: 24px
+
+  .bell-icon
+    width: 24px
+    height: 24px
+
+  .header-inputs
+    cursor: pointer
+    border: none
+    outline: none
+    background-color: transparent
+    color: var(--btn-blue-color)
+    height: 100%
+    box-sizing: border-box
+    font-family: Raleway
+    font-style: normal
+    font-weight: 500
+    font-size: 16px
+    line-height: 19px
+    font-feature-settings: 'pnum' on, 'lnum' on
+    display: inline-block
+    vertical-align: middle
+    &::placeholder
+      color: var(--btn-blue-color)
+      opacity: 0.5
+
+  .select
+    -webkit-appearance: none
+    -moz-appearance: none
+    -ms-appearance: none
+    appearance: none
+    background: url(../../assets/icons/down-arrow-1.svg) no-repeat right top 4px
+    overflow: hidden
+    margin-right: 16px
+    padding: 2px 20px 2px 30px
+
+  .search-input
+    margin-left: 14px
+    padding: 2px
+
+  .header-inputs-separator
+    display: inline-block
+    vertical-align: middle
+    border-left: 1px solid var(--btn-blue-color)
+    opacity: 0.5
+    border-radius: 4px
+    height: 100%
+
+  .avatar-wrapper
+    display: flex
+    flex-direction: row
+    justify-content: center
+    align-items: center
+
+  .btn-down-arrow
+    display: flex
+    justify-content: center
+    align-items: center
+
+  .avatar-img
+    width: 32px
+    height: 32px
+    margin-right: 8px
+</style>