PWA for iPhone and iPad: PNG icons, splash screens, manifest; stay signed in for 180 days

- iOS ignores SVG touch icons: add 120/152/167/180 apple-touch-icons, 192/512 and maskable manifest icons,
  and 25 splash screens (every iPhone size, iPad portrait+landscape incl. 12.9")
- Icons and splash screens are public so iOS can fetch them without a session
- Manifest: id, scope, categories, shortcuts; iOS standalone polish (no callout, no overscroll)
- Sessions last SESSION_DAYS (default 180) and renew daily while in use
- tools/make-icons.py regenerates the artwork

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

public/manifest.webmanifest

@@ -1,11 +1,95 @@
 {
+  "id": "/",
   "name": "NE Hub",
   "short_name": "NE Hub",
+  "description": "Files, documents, music, calendar, tasks and more in one place.",
   "start_url": "/",
+  "scope": "/",
   "display": "standalone",
+  "display_override": [
+    "standalone",
+    "minimal-ui"
+  ],
+  "orientation": "any",
   "background_color": "#0f1115",
   "theme_color": "#0f1115",
+  "categories": [
+    "productivity",
+    "utilities"
+  ],
+  "lang": "en",
   "icons": [
-    { "src": "/icon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any maskable" }
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/icons/icon-maskable-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/icons/icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Files",
+      "url": "/#/files",
+      "icons": [
+        {
+          "src": "/icons/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    },
+    {
+      "name": "Calendar",
+      "url": "/#/calendar",
+      "icons": [
+        {
+          "src": "/icons/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    },
+    {
+      "name": "Tasks",
+      "url": "/#/tasks",
+      "icons": [
+        {
+          "src": "/icons/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    },
+    {
+      "name": "Music",
+      "url": "/#/music",
+      "icons": [
+        {
+          "src": "/icons/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    }
   ]
-}
+}