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>
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