AGP 8.13 defaults to build-tools 35.0.0, but the provisioned / read-only CI SDK (/opt/android-sdk) has only 36.0.0 installed, so a gradle build (the app + the cap-sync-generated Capacitor modules) fails trying to auto-install 35 into a read-only dir. Pin buildToolsVersion 36.0.0 for every Android sub-project (compileSdk-matching) so the CI android-build signed release and local builds work. Verified: a local assembleDebug now builds app-debug.apk. ci.yaml does not build Android (only the manual android-build workflow does), so this is verified locally.
Add @capacitor/{core,android,app,cli,assets} to ui/, a capacitor.config.ts (appId ru.eruditgame.app, appName Эрудит, webDir dist — bundle model, no server.url), and the generated ui/android/ Gradle project (tracked; build outputs and the machine-specific local.properties gitignored, keystore patterns un-commented so signing material can never be committed). Wire the Android hardware Back button in ui/src/lib/native.ts behind a dynamic @capacitor/app import (web/mock bundles never load it), called from App.svelte onMount and reusing routeDepth for the navigation-root check. Whitelist sharp in pnpm-workspace.yaml for @capacitor/assets icon generation.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Ilia Denisov