feat(pwa): 完善 iOS 启动与主题恢复

scripts/generate-pwa-splash.mjs

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+import { mkdir } from 'node:fs/promises'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import sharp from 'sharp'
+import appleSplashSpecs from './pwa-splash-specs.json' with { type: 'json' }
+
+const projectRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
+const logoPath = path.join(projectRoot, 'public', 'logo.svg')
+const outputDirectory = path.join(projectRoot, 'public', 'splash')
+const background = '#0E1116'
+
+async function createSplash(width, height, scaleFactor, outputPath, format) {
+  // Match the DOM loader's `min(160px, 36vw)` in CSS pixels, then convert it
+  // to physical pixels for the selected Apple launch image.
+  const logoSize = Math.round(Math.min(160, (width / scaleFactor) * 0.36) * scaleFactor)
+  const logo = await sharp(logoPath).resize(logoSize, logoSize, { fit: 'contain' }).png().toBuffer()
+  const image = sharp({
+    create: {
+      width,
+      height,
+      channels: 4,
+      background,
+    },
+  }).composite([
+    {
+      input: logo,
+      left: Math.round((width - logoSize) / 2),
+      top: Math.round((height - logoSize) / 2),
+    },
+  ])
+
+  if (format === 'png') {
+    await image.png({ compressionLevel: 9 }).toFile(outputPath)
+    return
+  }
+
+  await image.flatten({ background }).jpeg({ quality: 88, progressive: true }).toFile(outputPath)
+}
+
+await mkdir(outputDirectory, { recursive: true })
+
+for (const { width: portraitWidth, height: portraitHeight, scaleFactor } of appleSplashSpecs) {
+  const landscapeWidth = portraitHeight
+  const landscapeHeight = portraitWidth
+
+  await createSplash(
+    portraitWidth,
+    portraitHeight,
+    scaleFactor,
+    path.join(outputDirectory, `apple-splash-${portraitWidth}-${portraitHeight}.jpg`),
+    'jpg',
+  )
+  await createSplash(
+    landscapeWidth,
+    landscapeHeight,
+    scaleFactor,
+    path.join(outputDirectory, `apple-splash-${landscapeWidth}-${landscapeHeight}.jpg`),
+    'jpg',
+  )
+}
+
+// Keep the previous fallback filename for older deployments and bookmarked
+// entries that may still reference it. Its palette matches the new assets.
+await createSplash(750, 1334, 2, path.join(outputDirectory, 'apple-splash.png'), 'png')
+
+console.log(
+  `Generated ${appleSplashSpecs.length * 2 + 1} PWA splash assets in ${path.relative(projectRoot, outputDirectory)}`,
+)

scripts/pwa-splash-specs.json

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+[
+  { "width": 2048, "height": 2732, "scaleFactor": 2 },
+  { "width": 1668, "height": 2388, "scaleFactor": 2 },
+  { "width": 1536, "height": 2048, "scaleFactor": 2 },
+  { "width": 1640, "height": 2360, "scaleFactor": 2 },
+  { "width": 1668, "height": 2224, "scaleFactor": 2 },
+  { "width": 1620, "height": 2160, "scaleFactor": 2 },
+  { "width": 1488, "height": 2266, "scaleFactor": 2 },
+  { "width": 1320, "height": 2868, "scaleFactor": 3 },
+  { "width": 1206, "height": 2622, "scaleFactor": 3 },
+  { "width": 1260, "height": 2736, "scaleFactor": 3 },
+  { "width": 1290, "height": 2796, "scaleFactor": 3 },
+  { "width": 1179, "height": 2556, "scaleFactor": 3 },
+  { "width": 1170, "height": 2532, "scaleFactor": 3 },
+  { "width": 1284, "height": 2778, "scaleFactor": 3 },
+  { "width": 1125, "height": 2436, "scaleFactor": 3 },
+  { "width": 1242, "height": 2688, "scaleFactor": 3 },
+  { "width": 828, "height": 1792, "scaleFactor": 2 },
+  { "width": 1242, "height": 2208, "scaleFactor": 3 },
+  { "width": 750, "height": 1334, "scaleFactor": 2 },
+  { "width": 640, "height": 1136, "scaleFactor": 2 }
+]