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There was essentially no logging — useless for proving the app renders across different environments. Add real observability: - tauri-plugin-log -> stdout (so `2>&1 | tee` captures a run) AND a persistent file in the app log dir (grabbable after the fact on any machine). Level Info. - Startup diagnostics: app version, OS/arch, the Linux display/session stack (XDG_SESSION_TYPE, desktop, Wayland/X11, GDK_BACKEND), the WebKit render- hardening vars actually in effect, resolved log + data dirs, DB open/migrate result, and note/label counts. - log_event command + a frontend logEvent() helper: boot line (data source + WebKit user-agent) from main.ts, first-route config/session/destination from the router guard, and — via the bridge invoke() wrapper — every failed Tauri command named with its error, so a broken basic function is self-identifying. Task 2040. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm