fix(e2e): reuse discovery browser + fix purchase-journey single-site check (#167 #168)

[JonasJesus42]

Summary

• parity e2e 0.17.6 killed (exit 137/OOM) after LLM selector discovery on macOS with low memory #167 Eliminates the double Chromium launch that OOMs machines with ~1.4 GB free RAM. runLiveSelectorValidation now returns the open browser instead of closing it; runSelectorDiscoveryPass returns Browser | null; e2e.ts reuses the discovery browser for the main flow, falling back to launchBrowser() only when discovery was skipped. Also suppresses the spurious categoryLink validation when plpUrlHint is already configured.
• parity e2e: purchase-journey-flow shows 0 steps evaluated in report even when flow runs successfully #168 Fixes the spurious 'prod nao produziu captura da purchase-journey' in single-site mode. candFlows carries ALL flow captures (homepage, plp, pdp) not only purchase-journey, so candFlows.length > 0 was true even when no purchase-journey capture existed. The guard now checks candFlows.some(f => f.flow === 'purchase-journey').
• Closes parity e2e hangs at browser launch (exit 144) on macOS with localhost #163 and purchase-journey: detect and dismiss overlays that intercept clicks mid-flow (not just at step start) #165 (already fixed in f17909a, issues closed via gh).

Test plan

• bun test tests/checks/purchase-journey-flow.test.ts — 12 tests pass
• On a machine with ~1.4 GB free RAM: parity e2e --url http://localhost:5173/ no longer exits 137
• parity e2e report shows actual step counts for purchase-journey (not 0)

🤖 Generated with Claude Code

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Summary by cubic

Reuses the discovery Chromium instance to avoid a second launch that can OOM low‑RAM machines, and fixes single‑site purchase‑journey detection to stop false “no capture” errors. Also bumps @decocms/parity to 0.17.7.

• Performance

  • Reuse the discovery browser for the main flow; launch only if discovery was skipped.
  • runLiveSelectorValidation now returns the open browser; runSelectorDiscoveryPass returns Browser | null.
  • Spinner text updated to reflect reuse.

• Bug Fixes

  • Single-site check now requires a purchase-journey capture via candFlows.some(f => f.flow === 'purchase-journey').
  • Skip categoryLink discovery and validation when plpUrlHint is set to avoid false failures on mobile.

^{Written for commit d8f0fa5. Summary will update on new commits.}