fix(node-ui): align context graph label fallbacks

[Jurij89]

Summary

• Treat useMemoryEntities' initial URI-derived label as non-authoritative so unnamed urn:* entities fall back to readable URI-tail labels instead of raw URNs.
• Centralize memory label predicates in one shared list and reuse it across entity derivation and graph label configs.
• Add regression coverage for generic URN fallback labels and graph predicate consistency, including dc/elements/1.1/title.

Related

• Follow-up to fix(node-ui): clarify context graph entity labels #605.
• Addresses the two late-visible fix(node-ui): clarify context graph entity labels #605 review threads on generic URN fallbacks and graph label predicate drift.

Files changed

File	What
packages/node-ui/src/ui/lib/memoryLabels.ts	Adds the shared memory label predicate list.
packages/node-ui/src/ui/hooks/useMemoryEntities.ts	Uses the shared predicates and falls through when the current label is only the default URI-derived value.
packages/node-ui/src/ui/views/project/helpers.ts	Uses the shared predicates for layer graph labels.
packages/node-ui/src/ui/views/project/components.tsx	Uses the shared predicates for entity detail and subgraph mini graph labels.
packages/node-ui/src/ui/views/MemoryLayerView.tsx	Uses the shared predicates for standalone memory layer graph labels.
packages/node-ui/test/*	Adds/updates focused coverage for the two follow-up issues.

Test plan

• pnpm --filter @origintrail-official/dkg-node-ui exec vitest run test/use-memory-entities-labels.test.ts test/graph-label-predicates.test.ts test/ka-detail-label.test.ts test/ui-compat.test.ts
• git diff --check
• pnpm --filter @origintrail-official/dkg-node-ui run build
• pnpm --filter @origintrail-official/dkg-node-ui run build:ui
• Local PR reviewer round against pr-diff.patch: no actionable comments.

[github-actions]

Codex review completed — no issues found.