fix: replace empty header.png/news-welcome.png OG images with icon-1024.png

- OG/Twitter card now uses icon-1024.png (1024×1024) instead of the 0-byte header.png
- AltStore/SideStore news imageURL now uses icon-1024.png instead of 0-byte news-welcome.png
- Add icon-1024.webp (33KB vs 924KB PNG) for JSON-LD structured data

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: JoeMatt

public/icon-1024.webp

@@ -38,7 +38,7 @@ export async function GET() {
           caption: 'GameCube & Wii emulation on iOS and tvOS',
           date: new Date().toISOString().split('T')[0],
           tintColor: '#3B82F6',
-          imageURL: `${baseURL}/news-welcome.png`,
+          imageURL: `${baseURL}/icon-1024.png`,
           notify: false,
           url: 'https://icube-emu.com',
         },

src/app/api/altstore/route.ts

@@ -38,7 +38,7 @@ export async function GET() {
           caption: 'GameCube & Wii emulation on iOS and tvOS',
           date: new Date().toISOString().split('T')[0],
           tintColor: '#3B82F6',
-          imageURL: `${baseURL}/news-welcome.png`,
+          imageURL: `${baseURL}/icon-1024.png`,
           notify: false,
           url: 'https://icube-emu.com',
         },

src/app/api/sidestore/route.ts

@@ -36,9 +36,9 @@ export const metadata: Metadata = {
     url: "https://icube-emu.com",
     images: [
       {
-        url: "/header.png",
-        width: 1200,
-        height: 630,
+        url: "/icon-1024.png",
+        width: 1024,
+        height: 1024,
         alt: "iCube – GameCube & Wii Emulator for iOS & tvOS",
       },
     ],
@@ -50,7 +50,7 @@ export const metadata: Metadata = {
     title: "iCube – GameCube & Wii Emulator for iOS & tvOS",
     description:
       "Play classic Nintendo GameCube and Wii games on your iPhone, iPad, and Apple TV.",
-    images: ["/header.png"],
+    images: ["/icon-1024.png"],
   },
   icons: {
     icon: [
@@ -109,7 +109,7 @@ const jsonLd = {
   description:
     "A GameCube and Wii emulator for iOS and tvOS based on Dolphin. Play classic Nintendo games on your iPhone, iPad, and Apple TV.",
   url: "https://icube-emu.com",
-  image: "https://icube-emu.com/icon-1024.png",
+  image: "https://icube-emu.com/icon-1024.webp",
   author: {
     "@type": "Organization",
     name: "Provenance Emu",