feat: implement Sleepy sleep diary

public/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><rect width="512" height="512" rx="112" fill="#f5f4ed"/><circle cx="256" cy="256" r="168" fill="#141413"/><text x="256" y="322" text-anchor="middle" font-family="Georgia, serif" font-size="200" fill="#f5f4ed">☾</text><circle cx="356" cy="176" r="18" fill="#c96442"/></svg>

public/manifest.webmanifest

@@ -0,0 +1,10 @@
+{
+  "name": "Sleepy - дневник сна",
+  "short_name": "Sleepy",
+  "description": "Личный дневник сна.",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#f5f4ed",
+  "theme_color": "#f5f4ed",
+  "icons": [{ "src": "/favicon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any maskable" }]
+}

public/sw.js

@@ -0,0 +1,17 @@
+const CACHE = 'sleepy-v1';
+const ASSETS = ['/', '/manifest.webmanifest', '/favicon.svg'];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(caches.open(CACHE).then((cache) => cache.addAll(ASSETS)));
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(caches.keys().then((keys) => Promise.all(keys.filter((key) => key !== CACHE).map((key) => caches.delete(key)))));
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.method !== 'GET') return;
+  event.respondWith(fetch(event.request).catch(() => caches.match(event.request).then((cached) => cached ?? caches.match('/'))));
+});