PWA: install button, one icon badge for Signal, mail and tasks due, share target for files, manifest launch handler

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/sw.js

@@ -1,5 +1,6 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v8';
+const CACHE = 'hub-v9';
+const SHARE = 'hub-share'; // files shared into the app from other apps, held until the person picks a folder
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];
 
 // Install: keep the icons, and (when signed in) the page itself with the scripts and styles it names, so the app opens offline.
@@ -21,8 +22,19 @@ self.addEventListener('activate', e => {
   e.waitUntil(caches.keys().then(ks => Promise.all(ks.filter(k => k !== CACHE).map(k => caches.delete(k)))));
   self.clients.claim();
 });
+// Share target: other apps send files here (POST); keep them and open the app, which asks where to put them.
+async function takeShare(request) {
+  try {
+    const form = await request.formData(), c = await caches.open(SHARE);
+    for (const k of await c.keys()) await c.delete(k);
+    let i = 0;
+    for (const f of form.getAll('files')) if (f && f.name) await c.put('/share-files/' + (i++), new Response(f, { headers: { 'x-name': encodeURIComponent(f.name), 'content-type': f.type || 'application/octet-stream' } }));
+  } catch { /* nothing usable was shared */ }
+  return Response.redirect(self.location.origin + '/#/files', 303);
+}
 self.addEventListener('fetch', e => {
   const u = new URL(e.request.url);
+  if (e.request.method === 'POST' && u.origin === location.origin && u.pathname === '/share-target') return e.respondWith(takeShare(e.request));
   if (e.request.method !== 'GET' || u.origin !== location.origin || u.pathname.startsWith('/sf/') || u.pathname.startsWith('/plex/') || u.pathname.startsWith('/api/')) return;
   e.respondWith(fetch(e.request).then(r => {
     if (r.ok) { const copy = r.clone(); caches.open(CACHE).then(c => c.put(e.request, copy)); }