feat(android): generate launcher icons from zeavis-logo.svg during CI build

- Add scripts/generate-icons.js using sharp to convert SVG to PNG
  at all Android density buckets (mdpi 48→xxxhdpi 192)
- Add sharp as devDependency
- Update CI workflow to run icon generation after tauri android init
- Replaces Tauri's default icons with ZeaVis Edu logo

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

apps/tauri/package.json

@@ -12,5 +12,8 @@
   },
   "devDependencies": {
     "@tauri-apps/cli": "^2"
+  },
+  "dependencies": {
+    "sharp": "0.35.1"
   }
 }

apps/tauri/scripts/generate-icons.js

@@ -0,0 +1,65 @@
+#!/usr/bin/env node
+/**
+ * Generate Android launcher icons from the ZeaVis Edu logo SVG.
+ * Produces PNGs at all required densities and replaces Tauri's default icons.
+ *
+ * Usage: node scripts/generate-icons.js
+ * Requires: bun add sharp (already in devDependencies)
+ */
+
+const sharp = require('sharp');
+const fs = require('fs');
+const path = require('path');
+
+const LOGO = path.resolve(__dirname, '../../../.github/assets/zeavis-logo.svg');
+const RES = path.resolve(__dirname, '../gen/android/app/src/main/res');
+
+// Android density buckets: [folder, size]
+const DENSITIES = [
+  ['mipmap-mdpi', 48],
+  ['mipmap-hdpi', 72],
+  ['mipmap-xhdpi', 96],
+  ['mipmap-xxhdpi', 144],
+  ['mipmap-xxxhdpi', 192],
+];
+
+async function generate() {
+  if (!fs.existsSync(LOGO)) {
+    console.error(`ERROR: Logo not found at ${LOGO}`);
+    process.exit(1);
+  }
+
+  console.log(`Generating icons from ${LOGO}...`);
+
+  for (const [folder, size] of DENSITIES) {
+    const dir = path.join(RES, folder);
+    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+
+    const png = await sharp(LOGO)
+      .resize(size, size, { fit: 'contain', background: { r: 0, g: 0, b: 0, alpha: 0 } })
+      .png()
+      .toBuffer();
+
+    // Write both legacy and adaptive icon names
+    for (const name of ['ic_launcher.png', 'ic_launcher_foreground.png', 'ic_launcher_round.png']) {
+      fs.writeFileSync(path.join(dir, name), png);
+    }
+    console.log(`  ${folder}: ${size}x${size} OK`);
+  }
+
+  // Also write the legacy icon to drawable for completeness
+  const drawableDir = path.join(RES, 'drawable');
+  if (!fs.existsSync(drawableDir)) fs.mkdirSync(drawableDir, { recursive: true });
+  const refPng = await sharp(LOGO)
+    .resize(144, 144, { fit: 'contain', background: { r: 0, g: 0, b: 0, alpha: 0 } })
+    .png()
+    .toBuffer();
+  fs.writeFileSync(path.join(drawableDir, 'ic_launcher.png'), refPng);
+
+  console.log('Done. Android launcher icons generated.');
+}
+
+generate().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});