chore(build): drop unused imports + rebuild bundle

vue-tsc -b is stricter than --noEmit; the StickerTray emoji input
ref and the StickerCanvas customAssetUrl import were unused.

frontend/src/components/StickerCanvas.vue

@@ -221,7 +221,7 @@ function imageStickerConfig(s: StickerLayer) {
 }
 
 import { STICKERS } from '@/assets/stickers/index'
-import { CUSTOM_STICKER_ASSETS, customAssetUrl } from '@/assets/stickers/customAssets'
+import { CUSTOM_STICKER_ASSETS } from '@/assets/stickers/customAssets'
 
 function emojiFor(s: StickerLayer): string {
   // New stickers carry the glyph directly; legacy stickers fall back to

frontend/src/components/StickerTray.vue

@@ -46,7 +46,6 @@
         <h3 class="sticker-tray__heading">Any emoji</h3>
         <p class="sticker-tray__hint">Tap the box, then pick from your keyboard's emoji button.</p>
         <input
-          ref="emojiInputRef"
           type="text"
           class="sticker-tray__emoji-input"
           inputmode="text"
@@ -87,7 +86,6 @@ const RECENTS_KEY = 'pf.stickerTray.recents'
 const MAX_RECENTS = 12
 
 const recents = ref<RecentItem[]>([])
-const emojiInputRef = ref<HTMLInputElement>()
 
 onMounted(() => {
   recents.value = loadRecents()