Replace fetch polling in JobsIndicator with EventSource connected to
/api/jobs/stream. Fix the SSE route to return all jobs (via
/index/status) instead of only active ones, since JobsList also
consumes this stream for the full job history. JobsIndicator now
filters active jobs client-side. SSE server-side uses adaptive
interval (2s active, 15s idle) and only sends when data changes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>