feat: Update workbench evals

[maciaszczykm]

[linear]

PROD-4824

[greptile-apps]

Greptile Summary

This PR updates the workbench evaluations workflow with URL-based selection, new shared components, and navigation improvements. Selected eval results are now tracked in the URL (/evals/:evalResultId), enabling deep-linking, and a grade badge is added to the jobs table for quick navigation to eval details.

• URL-driven eval selection — WorkbenchEvals replaces local state with useParams and a redirect effect, using replace: true so history is not polluted; route definitions in workbenchesRoutes.tsx are updated accordingly.
• New shared components — WorkbenchEvalGradeBadge (correctly guards against grade 0 with != null), WorkbenchEvalSkillButton (popup for generating skills from an eval), and WorkbenchStartedJobPanel (extracted from FlowWorkbenchJobLauncher, now also surfaces query errors).
• WorkbenchJobTiny GraphQL fragment updated to include evalResult { id, grade }, covering all new table and badge usages.

Confidence Score: 5/5

Safe to merge — changes are additive UI/routing improvements with no data-mutation risk.

All new components follow existing patterns, GraphQL fragments are correctly extended, the evalResult.grade != null guard properly handles grade 0, and the URL-based navigation redirect uses replace: true to avoid history pollution. No functional regressions were identified.

No files require special attention.

Important Files Changed

Filename	Overview
assets/src/components/workbenches/workbench/evals/WorkbenchEvals.tsx	Migrates selected eval tracking from local state to URL params, with a useEffect that redirects to the first result when none is specified — logic is sound, no loop risk, and navigation uses replace: true.
assets/src/components/workbenches/common/WorkbenchEvalSkillButton.tsx	New component for creating workbench skills from an eval result; uses a ref to detect eval ID changes on open and reset state correctly.
assets/src/components/workbenches/common/WorkbenchStartedJobPanel.tsx	Code extracted from FlowWorkbenchJobLauncher into a reusable component; now also surfaces queryError that was silently swallowed in the original implementation.
assets/src/components/workbenches/common/WorkbenchEvalGradeBadge.tsx	New shared badge component for eval grades; handles grade 0 correctly.
assets/src/components/workbenches/workbench/WorkbenchJobsTable.tsx	Adds eval grade badge to the jobs table using evalResult.grade != null guard (correctly handles grade 0), navigating to getWorkbenchEvalResultAbsPath on click.
assets/src/routes/workbenchesRoutes.tsx	Adds a new evals/:evalResultId child route alongside the existing evals route, enabling deep-linking to a specific eval result.
assets/src/graph/workbench.graphql	Adds evalResult { id, grade } to WorkbenchJobTiny fragment and adds WorkbenchEvalSkill mutation; fragment fields correctly cover all new usages in the UI.

_{Reviews (2): Last reviewed commit: "fix review finding" | Re-trigger Greptile}

[maciaszczykm]

@greptileai