pwa / offline mode

- @vite-pwa/sveltekit: workbox precache (incl. pdfjs worker), generated manifest, prompt-style updates via PwaUpdatePrompt toast
- prerendered routes for offline navigation, PWA icons, theme-color + apple-touch-icon
- pwa offline/update e2e suite (pnpm test:pwa, playwright.pwa.config.ts)
- datenschutz: offline/install section; prettier cleanup of shadcn components

src/lib/components/icons/IconNeedle.svelte

@@ -2,8 +2,14 @@
 </script>
 
 <svg width="23" height="24" viewBox="0 0 23 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-    <path d="M20.4129 7.29267L14.1203 1C14.1203 1 11.8437 8.76535 4.14746 10.9744L11.7731 18.6C13.9805 10.9022 21.7475 8.62562 21.7475 8.62562L15.4548 2.33295" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/>
-    <path d="M7.28204 14.2833L8.8 15.8656L1.51796 23.0833L1.36219 22.921C0.606308 22.1331 0.622023 20.8845 1.3975 20.1159L7.28204 14.2833Z" fill="currentColor"/>
+	<path
+		d="M20.4129 7.29267L14.1203 1C14.1203 1 11.8437 8.76535 4.14746 10.9744L11.7731 18.6C13.9805 10.9022 21.7475 8.62562 21.7475 8.62562L15.4548 2.33295"
+		stroke="currentColor"
+		stroke-width="2"
+		stroke-linejoin="round"
+	/>
+	<path
+		d="M7.28204 14.2833L8.8 15.8656L1.51796 23.0833L1.36219 22.921C0.606308 22.1331 0.622023 20.8845 1.3975 20.1159L7.28204 14.2833Z"
+		fill="currentColor"
+	/>
 </svg>
-
-