Implemented Gallery view for media files.

frontend/src/components/SelectBox.vue

@@ -0,0 +1,23 @@
+<template>
+  <input type=checkbox tabindex=-1 :checked="store.selected.has(doc.key)"
+    @change="ev => {
+      if ((ev.target as HTMLInputElement).checked) {
+        store.selected.add(doc.key)
+      } else {
+        store.selected.delete(doc.key)
+      }
+    }"
+  >
+</template>
+
+<script setup lang=ts>
+import { defineProps } from 'vue'
+import { useMainStore } from '@/stores/main'
+import type { Doc } from '@/repositories/Document'
+
+const props = defineProps<{
+  doc: Doc
+}>()
+const store = useMainStore()
+
+</script>