Improve home page responsive layout and overflow handling

Rework media query breakpoints and grid placement for better
tablet/mobile display. Add overflow-auto to Radio, Links, and
Listening components. Add Links header. Simplify Intro2 animation
initial positions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vue/src/components/util/Radio.vue

@@ -1,10 +1,10 @@
 <template>
-    <div v-if="streamLive" class="overflow-hidden">
+    <div v-if="streamLive" class="overflow-auto">
         <Header>Radio</Header>
         <img src="/img/tmpen31z3pe.PNG" alt="Radio" width="176" height="177" />
         <audio controls :src="streamUrl" ref="audio"></audio>
     </div>
-    <div v-else>
+    <div v-else class="overflow-auto">
         <Header>Radio</Header>
         <img src="/img/tmpen31z3pe.PNG" alt="Radio" width="176" height="177" />
         <div class="m-1 text-center">