fix(node-ui): restore context graph detail origins

[Jurij89]

Summary

• Capture the Context Graph route/tab/scroll origin before entity drill-in and restore it when the detail view closes.
• Keep cross-subgraph entity links inside the detail route instead of silently switching the underlying subgraph page.
• Control layer and subgraph tabs from ProjectView, with stable scroll keys on the actual scroll roots used by restoration.
• Rename the detail back action to "Back to Context Graph" for M2 terminology alignment.

Related

• Follow-up to fix(node-ui): fill context graph route panel #598
• Context Graph UX rollout PR 1.2 / M2

Files changed

File	What
packages/node-ui/src/ui/views/ProjectView.tsx	Adds origin snapshot/restore handling, controlled layer/subgraph tab state, and detail close routing.
packages/node-ui/src/ui/views/project/components.tsx	Exposes controlled tabs, moves scroll keys onto stable scroll containers, and updates detail back copy.
packages/node-ui/test/project-view-navigation.test.ts	Covers origin restoration and cross-subgraph detail navigation behavior.
packages/node-ui/test/ka-detail-label.test.ts	Covers the rendered detail back-label copy.

Test plan

• pnpm --filter @origintrail-official/dkg-node-ui exec vitest run test/project-view-navigation.test.ts test/ka-detail-label.test.ts test/ui-compat.test.ts test/use-memory-entities-live-updates.test.ts test/use-memory-entities-partial.test.ts
• pnpm --filter @origintrail-official/dkg-node-ui run build
• pnpm --filter @origintrail-official/dkg-node-ui run build:ui
• git diff --check
• In-app browser boot smoke at http://localhost:5176/ui/ with no console errors or warnings.
• Local PR review: 4 rounds, final result had no actionable comments.

Note: the local dev node had zero context graphs, so the full live drill-in/back walkthrough still needs a populated-node manual pass.

[github-actions]

Codex review produced 3 comment(s) but all targeted lines outside the diff and were dropped. Check the workflow logs for details.

[github-actions]

Codex review completed — no issues found.