Adds structured stream-resume instrumentation to the dashboard across four SSE hooks (PR checks, dev-server logs, research, background sessions), wiring `[wake-trigger-diagnostics]` log markers and view-resume route guards so the engine can distinguish cold starts from resume paths; includes tests f
Fusion-Task-Id: FN-5416
- Add dev-server port detection utilities and wire detected preview state into process/manager lifecycle
- Normalize dev-server status API responses with preview URL, detected port, and manual override compatibility
- Introduce useDevServerLogs and DevServerLogViewer, and integrate them into the DevServer dashboard view
- Expand dashboard test coverage for detection edges, process/routes behavior, log history handling, and CSS regressions
