feat: improve PWA configuration (#2214)

---
PWA Errors:
---
- fix logo size
- add shortcut icon
- add maskable icons
- add desktop and phone screenshots (wide and narrow)

lnbits/core/views/generic.py

@@ -359,9 +359,44 @@ async def manifest(request: Request, usr: str):
                     if settings.lnbits_custom_logo
                     else "https://cdn.jsdelivr.net/gh/lnbits/lnbits@main/docs/logos/lnbits.png"
                 ),
+                "sizes": "512x512",
                 "type": "image/png",
-                "sizes": "900x900",
+            },
-            }
+            {"src": "/static/favicon.ico", "sizes": "32x32", "type": "image/x-icon"},
+            {
+                "src": "/static/images/maskable_icon_x192.png",
+                "type": "image/png",
+                "sizes": "192x192",
+                "purpose": "maskable",
+            },
+            {
+                "src": "/static/images/maskable_icon_x512.png",
+                "type": "image/png",
+                "sizes": "512x512",
+                "purpose": "maskable",
+            },
+            {
+                "src": "/static/images/maskable_icon.png",
+                "type": "image/png",
+                "sizes": "1024x1024",
+                "purpose": "maskable",
+            },
+        ],
+        "screenshots": [
+            {
+                "src": "/static/images/screenshot_desktop.png",
+                "sizes": "2394x1314",
+                "type": "image/png",
+                "form_factor": "wide",
+                "label": "LNbits - Desktop screenshot",
+            },
+            {
+                "src": "/static/images/screenshot_phone.png",
+                "sizes": "1080x1739",
+                "type": "image/png",
+                "form_factor": "narrow",
+                "label": "LNbits - Phone screenshot",
+            },
         ],
         "start_url": f"/wallet?usr={usr}&wal={user.wallets[0].id}",
         "background_color": "#1F2234",
@@ -375,6 +410,13 @@ async def manifest(request: Request, usr: str):
                 "short_name": wallet.name,
                 "description": wallet.name,
                 "url": f"/wallet?usr={usr}&wal={wallet.id}",
+                "icons": [
+                    {
+                        "src": "/static/images/maskable_icon_x96.png",
+                        "sizes": "96x96",
+                        "type": "image/png",
+                    }
+                ],
             }
             for wallet in user.wallets
         ],