mawkone 0f90ef6f5c Fix preview pipeline: dedup duplicate previews, race-safe dev server start, honest readiness ...

- Add partial unique index on (project_id, port) for active dev servers so the
  SELECT-then-INSERT race can no longer create duplicate 'Port 3000' rows.
- Make startDevServer race-safe: on unique violation, adopt the winning row
  instead of duplicating.
- ensure route no longer marks a server 'running' before it binds the port;
  the readiness probe flips starting->running only after the port answers.
  Kills the '502 -> broken CSS -> works' refresh loop.
- Deduplicate previews per-port in sortDevPreviewsFrontendFirst as a defensive
  backstop for the dropdown.
- Revert iframe _refresh query-param hack (was forcing cold recompiles).

2026-06-12 16:57:06 -07:00

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