giles f11cec9d48 Add SPA-style navigation for plan nodes ...

- Add /run/{run_id}/plan/node/{step_id} endpoint for node details
- Node click updates URL without full page reload (pushState)
- Browser back/forward works correctly
- Refreshing page preserves selected node via ?node= parameter
- Node details loaded via fetch with partial HTML response

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-11 09:30:27 +00:00

267 KiB

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