Change Jump to Context menu to be a dropdown menu

I extracted the dropdown portion of the LogActionsToolbar into a separate DropdownMenu component so that it can be reused for Jump to Context.

Other Changes:
- Remove unused style in LogActionsToolbar

assets/components/DropdownMenu.vue

@@ -0,0 +1,27 @@
+<template>
+  <div class="dropdown is-hoverable">
+    <div class="dropdown-trigger">
+      <button class="button" aria-haspopup="true" aria-controls="dropdown-menu">
+        <span class="icon">
+          <mdi-dots-vertical />
+        </span>
+      </button>
+    </div>
+    <div class="dropdown-menu" id="dropdown-menu" role="menu">
+      <div class="dropdown-content">
+        <slot></slot>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script lang="ts" setup></script>
+
+<style lang="scss" scoped>
+.is-top .dropdown-menu {
+  top: 0;
+}
+.is-small {
+  transform: scale(75%);
+}
+</style>