Introduce Daymark public edition with isolated deployment configuration

public/field-log-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="72" fill="#1a1b26"/>
+  <path d="M112 96h288v320H112z" fill="#24283b" stroke="#7aa2f7" stroke-width="18"/>
+  <path d="M164 164h184M164 224h184M164 284h128" stroke="#c0caf5" stroke-width="18" stroke-linecap="square"/>
+  <path d="M318 348h48" stroke="#9ece6a" stroke-width="18"/>
+</svg>

public/manifest.webmanifest

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+{
+  "name": "Daymark",
+  "short_name": "Daymark",
+  "description": "Private self-hosted notes, diary entries, and media.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#1a1b26",
+  "theme_color": "#1a1b26",
+  "icons": [
+    {
+      "src": "/field-log-icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ],
+  "shortcuts": [
+    { "name": "New entry", "short_name": "New", "url": "/?new=1" },
+    { "name": "Gallery", "short_name": "Gallery", "url": "/?view=gallery" },
+    { "name": "Map", "short_name": "Map", "url": "/?view=map" }
+  ],
+  "share_target": {
+    "action": "/?share=1",
+    "method": "GET",
+    "params": { "title": "title", "text": "text", "url": "url" }
+  }
+}

public/sw.js

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+const CACHE = "field-log-shell-v1";
+const SHELL = ["/", "/manifest.webmanifest", "/field-log-icon.svg"];
+self.addEventListener("install", (event) => {
+  event.waitUntil(caches.open(CACHE).then((cache) => cache.addAll(SHELL)));
+  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) => {
+  const request = event.request;
+  if (
+    request.method !== "GET" ||
+    new URL(request.url).pathname.startsWith("/api/")
+  )
+    return;
+  event.respondWith(
+    fetch(request)
+      .then((response) => {
+        if (response.ok)
+          caches
+            .open(CACHE)
+            .then((cache) => cache.put(request, response.clone()));
+        return response;
+      })
+      .catch(() =>
+        caches.match(request).then((cached) => cached || caches.match("/")),
+      ),
+  );
+});