DUNGEONS-34: implement Webka local streaming app

Co-authored-by: multica-agent <github@multica.ai>

frontend/components/GlassCard.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+const props = withDefaults(defineProps<{ as?: string }>(), { as: "section" });
+function highlight(e: PointerEvent) {
+  if (matchMedia("(prefers-reduced-motion: reduce)").matches) return;
+  const element = e.currentTarget as HTMLElement;
+  const r = element.getBoundingClientRect();
+  element.style.setProperty("--glass-x", `${e.clientX - r.left}px`);
+  element.style.setProperty("--glass-y", `${e.clientY - r.top}px`);
+}
+</script>
+<template>
+  <component :is="props.as" class="glass" @pointermove="highlight"
+    ><slot
+  /></component>
+</template>