Fix Android navigation and improve UI responsiveness

- Convert music category buttons from <button> to native <a> links for better Android compatibility
- Convert artist/album nested buttons in TrackList to <a> links to fix HTML validation issues
- Add event handlers with proper stopPropagation to maintain click behavior
- Increase library overview card sizes from medium to large (50% bigger)
- Increase thumbnail sizes in list view from 10x10 to 16x16
- Add console logging for debugging click events on mobile
- Remove preventDefault() handlers that were blocking Android touch events

These changes resolve navigation issues on Android devices where buttons weren't responding to taps. Native <a> links provide better cross-platform compatibility and allow SvelteKit to handle navigation more reliably.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/lib/components/library/MediaCard.svelte

@@ -91,8 +91,15 @@
 
 <button
   type="button"
-  class="group/card flex flex-col text-left {sizeClasses[size]} flex-shrink-0 transition-transform duration-200 hover:scale-105"
-  {onclick}
+  class="group/card flex flex-col text-left {sizeClasses[size]} flex-shrink-0 transition-transform duration-200 hover:scale-105 cursor-pointer active:scale-95"
+  onclick={() => {
+    console.log('[MediaCard] click event - item:', item.id, item.name);
+    onclick?.();
+  }}
+  onpointerup={() => {
+    console.log('[MediaCard] pointer up event - item:', item.id, item.name);
+    onclick?.();
+  }}
 >
   <div class="relative {aspectRatio()} w-full rounded-lg overflow-hidden bg-[var(--color-surface)] shadow-md group-hover/card:shadow-2xl transition-shadow duration-200">
     {#if imageUrl}