feat(FN-2170): add dev-server preview detection and log viewer flow
- 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
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