add cool git commit thing

src/components/AppFooter.vue

@@ -4,7 +4,7 @@
     height="40"
   >
   <div class="text-caption">
-    StudSpider 0.2 (<small>5288d</small>)
+    StudSpider 0.2 <small>(<a href="http://git.traps.moe/ph0sgene/studspider-status/commits/branch/master">{{ gitHash }}</a>)</small>
     </div>  
     <a
       v-for="item in items"
@@ -43,6 +43,8 @@
 <script setup>
 import { computed } from 'vue'
 
+const gitHash = __GIT_COMMIT_HASH__
+
 const copyrightYear = computed(() => {
   const currentYear = new Date().getFullYear()
   const startYear = 2025