Refactor ActivityPage with extracted stats and history components

- Extract StatsOverview component for watch statistics display
- Extract WatchHistory component for recently watched content
- Reduce ActivityPage from 490 to 346 lines (~29% reduction)
- Move stats card styles to StatsOverview component
- Move watch history list styles to WatchHistory component
- Clean up useTautulliStats composable
- Improve Graph component for better chart rendering
- Maintain three clear sections: stats, controls+graphs, history
- Follow component extraction pattern from settings refactor

src/components/activity/WatchHistory.vue

@@ -0,0 +1,101 @@
+<template>
+  <div v-if="topContent.length > 0" class="watch-history">
+    <h3 class="section-title">Last Watched</h3>
+    <div class="top-content-list">
+      <div
+        v-for="(item, index) in topContent"
+        :key="index"
+        class="top-content-item"
+      >
+        <div class="content-rank">{{ index + 1 }}</div>
+        <div class="content-details">
+          <div class="content-title">{{ item.title }}</div>
+          <div class="content-meta">
+            {{ item.type }} • {{ item.plays }} plays • {{ item.duration }}min
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+  interface TopContentItem {
+    title: string;
+    type: string;
+    plays: number;
+    duration: number;
+  }
+
+  interface Props {
+    topContent: TopContentItem[];
+  }
+
+  defineProps<Props>();
+</script>
+
+<style lang="scss" scoped>
+  @import "scss/variables";
+  @import "scss/media-queries";
+
+  .watch-history {
+    margin-top: 2rem;
+  }
+
+  .section-title {
+    margin: 0 0 1rem 0;
+    font-size: 1.2rem;
+    font-weight: 500;
+    color: $text-color;
+  }
+
+  .top-content-list {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+    gap: 1rem;
+
+    @include mobile-only {
+      grid-template-columns: 1fr;
+    }
+  }
+
+  .top-content-item {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+    background: var(--background-ui);
+    padding: 1rem;
+    border-radius: 8px;
+    border: 1px solid var(--text-color-50);
+    transition: all 0.2s;
+
+    &:hover {
+      border-color: var(--text-color);
+      transform: translateY(-2px);
+    }
+  }
+
+  .content-rank {
+    font-size: 1.5rem;
+    font-weight: 700;
+    color: var(--highlight-color);
+    min-width: 2.5rem;
+    text-align: center;
+  }
+
+  .content-details {
+    flex: 1;
+  }
+
+  .content-title {
+    font-size: 1rem;
+    font-weight: 600;
+    color: var(--text-color);
+    margin-bottom: 0.25rem;
+  }
+
+  .content-meta {
+    font-size: 0.85rem;
+    color: var(--text-color-60);
+  }
+</style>