feat: pwa manifest, icon and minimal service worker

web/public/icon.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="96" fill="#0a0a0a"/>
+  <circle cx="256" cy="256" r="160" fill="#171717" stroke="#34d399" stroke-width="16"/>
+  <circle cx="256" cy="256" r="96" fill="none" stroke="#262626" stroke-width="8"/>
+  <circle cx="256" cy="256" r="40" fill="#34d399"/>
+  <circle cx="256" cy="256" r="12" fill="#0a0a0a"/>
+</svg>

web/public/manifest.webmanifest

@@ -0,0 +1,13 @@
+{
+  "name": "record-shop",
+  "short_name": "record-shop",
+  "description": "Track your physical music collection",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0a0a0a",
+  "theme_color": "#0a0a0a",
+  "icons": [
+    { "src": "/icon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any" },
+    { "src": "/icon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "maskable" }
+  ]
+}

web/public/sw.js

@@ -0,0 +1,11 @@
+self.addEventListener('install', () => {
+  self.skipWaiting()
+})
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(self.clients.claim())
+})
+
+self.addEventListener('fetch', () => {
+  // no-op: presence of a fetch handler enables PWA install
+})