f13a63dc2f
- Custom ToastContext + ToastProvider + ToastContainer (~170 lines, no deps) - useEvents() SSE hook with exponential backoff reconnect - EventProvider context for app-wide SSE stream sharing - Event-to-toast bridge with severity mapping and deduplication - Real-time status badge updates replacing 30s polling - EventSource auth probe (401/429 detection via fetch) - 14 frontend tests (useEvents + toast-rules) Quality gates: vitest 14 passed, tsc clean, eslint clean