feat: apply trans-pride gradient theme across UI elements

- Add global CSS classes for trans gradient styling (btn-trans-gradient,
  input-trans-focus, icon-trans-hover)
- Update all primary action buttons to use trans gradient
- Add trans-pride glow effect to character panel based on state
- Update StatusBar icon buttons with trans gradient hover
- Update chat input focus border with trans gradient glow
- Update stop button to use trans gradient

src/lib/components/UpdateNotification.svelte

@@ -55,7 +55,7 @@
         <div class="flex gap-2">
           <button
             onclick={openRelease}
-            class="px-3 py-1.5 bg-[var(--accent-primary)] text-white rounded text-sm hover:brightness-110 transition-all"
+            class="btn-trans-gradient px-3 py-1.5 rounded text-sm"
           >
             View Release
           </button>