Add developer toolkit UI component

The commit adds a new a UI component that's enabled in development mode.
This component, initially, provides a button that wen clicked, logs all
the script and category names to the console. It helps revising names
used throughout the application.

By having this component in a conditionally rendered component, it's
excluded from the production builds.

src/presentation/components/DevToolkit/DevToolkit.vue

@@ -0,0 +1,71 @@
+<template>
+  <div class="dev-toolkit">
+    <div class="title">
+      Tools
+    </div>
+    <hr />
+    <button
+      v-for="action in devActions"
+      @click="action.handler"
+      :key="action.name"
+      type="button">
+      {{ action.name }}
+    </button>
+  </div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import { dumpNames } from './DumpNames';
+
+export default defineComponent({
+  setup() {
+    const devActions: readonly DevAction[] = [
+      {
+        name: 'Log script/category names',
+        handler: async () => {
+          const names = await dumpNames();
+          console.log(names);
+        },
+      },
+    ];
+    return {
+      devActions,
+    };
+  },
+});
+
+interface DevAction {
+  readonly name: string;
+  readonly handler: () => void | Promise<void>;
+}
+</script>
+
+<style scoped lang="scss">
+@use "@/presentation/assets/styles/main" as *;
+
+.dev-toolkit {
+  position: fixed;
+  top: 0;
+  right: 0;
+  background-color: rgba($color-on-surface, 0.5);
+  color: $color-on-primary;
+  padding: 10px;
+  z-index: 10000;
+
+  .title {
+    font-weight: bold;
+    text-align: center;
+  }
+
+  button {
+    display: block;
+    margin-bottom: 10px;
+    padding: 5px 10px;
+    background-color: $color-primary;
+    color: $color-on-primary;
+    border: none;
+    cursor: pointer;
+  }
+}
+</style>