feat: add ScrollToTopBtn component and integrate it into multiple pages

- Added ScrollToTopBtn component for smooth scrolling to the top of the page.
- Registered ScrollToTopBtn in main.ts.
- Integrated ScrollToTopBtn into browse.vue, discover.vue, recommend.vue, resource.vue pages.
- Updated components.d.ts to include ScrollToTopBtn type definition.
- Refactored MediaCard.vue and SlideView.vue for improved hover effects and styling.
- Cleaned up unused styles and optimized existing styles for better performance and readability.

src/@core/components/ScrollToTopBtn.vue

@@ -0,0 +1,62 @@
+<script lang="ts" setup>
+const scrollToTop = () => {
+  window.scrollTo({ top: 0, behavior: 'smooth' })
+}
+</script>
+
+<template>
+  <div class="global-action-buttons">
+    <button class="global-action-button" @click="scrollToTop">
+      <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+        <path
+          d="M7 14L12 9L17 14"
+          stroke="currentColor"
+          stroke-width="2"
+          stroke-linecap="round"
+          stroke-linejoin="round"
+        />
+      </svg>
+    </button>
+  </div>
+</template>
+
+<style lang="scss" scoped>
+.global-action-buttons {
+  position: fixed;
+  z-index: 100;
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  inset-block-end: 30px;
+  inset-inline-end: 30px;
+}
+
+.global-action-button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid rgba(var(--v-theme-on-surface), 0.1);
+  border-radius: 50%;
+  backdrop-filter: blur(6px);
+  background-color: rgba(var(--v-theme-surface), 0.8);
+  block-size: 44px;
+  color: rgb(var(--v-theme-on-surface));
+  cursor: pointer;
+  inline-size: 44px;
+  opacity: 0.7;
+  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
+
+  &:hover {
+    background-color: rgba(var(--v-theme-surface), 0.95);
+    color: rgb(var(--v-theme-primary));
+    opacity: 1;
+    transform: translateY(-4px);
+  }
+
+  svg {
+    block-size: 20px;
+    inline-size: 20px;
+    transition: all 0.3s ease;
+  }
+}
+</style>