Replace app logo with new orange starburst emblem across all contexts

Swapped in the new brand logo for every place the app icon appears:
- Favicon, apple-touch-icon, and og:image / twitter:image (via index.html
  references to /images/icon-1024.png)
- PWA manifest icons (any + maskable) and all app shortcuts
- In-app header logos (Layout, Index) and logo.png / logo-icon.png
- This same icon-1024.png is what the Zapstore listing pulls, so the store
  entry updates too

Also corrected the manifest icon "sizes" declarations to match the actual
asset dimensions (180x180) so browsers don't reject the icons for a
size mismatch.

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

public/manifest.webmanifest

@@ -19,19 +19,19 @@
   "icons": [
     {
       "src": "/images/icon-1024.png",
-      "sizes": "1024x1024",
+      "sizes": "180x180",
       "type": "image/png",
       "purpose": "any"
     },
     {
       "src": "/images/icon-maskable-1024.png",
-      "sizes": "1024x1024",
+      "sizes": "180x180",
       "type": "image/png",
       "purpose": "maskable"
     },
     {
       "src": "/images/icon-1024.png",
-      "sizes": "1024x1024",
+      "sizes": "180x180",
       "type": "image/png",
       "purpose": "any"
     }
@@ -61,7 +61,7 @@
       "icons": [
         {
           "src": "/images/icon-1024.png",
-          "sizes": "1024x1024",
+          "sizes": "180x180",
           "type": "image/png"
         }
       ]
@@ -74,7 +74,7 @@
       "icons": [
         {
           "src": "/images/icon-1024.png",
-          "sizes": "1024x1024",
+          "sizes": "180x180",
           "type": "image/png"
         }
       ]
@@ -87,7 +87,7 @@
       "icons": [
         {
           "src": "/images/icon-1024.png",
-          "sizes": "1024x1024",
+          "sizes": "180x180",
           "type": "image/png"
         }
       ]
@@ -100,7 +100,7 @@
       "icons": [
         {
           "src": "/images/icon-1024.png",
-          "sizes": "1024x1024",
+          "sizes": "180x180",
           "type": "image/png"
         }
       ]