fix(node-ui): rebuild verifiable memory panel

[Jurij89]

Summary

• Rebuilds the Verifiable Memory hero so the stat row contains numeric stats only and the Context Graph id moves into subtitle metadata.
• Adds a purposeful empty-VM state for zero Knowledge Assets and suppresses the duplicate generic layer/list empty widgets while preserving caller footers.
• Replaces the mismatched green-glow/stat/chip styling with one restrained, theme-aware border/surface treatment and adds focused component/integration coverage.

Scope / Gates

• Covers first-wave PR 1.6 / M4 only.
• Does not add S10 VM metadata, trust-level breakdowns, chain/token fields, provenance, or publish-flow assumptions.
• G-Q14/Q16 remains a narrow populated-VM re-check once a node with published VM Knowledge Assets is available; the empty-state/craft fix is fully verifiable now.

Verification

• pnpm --filter @origintrail-official/dkg-node-ui exec vitest run test/vm-hero-banner.test.ts
• pnpm --filter @origintrail-official/dkg-node-ui exec vitest run test/vm-hero-banner.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
• Branch-local Vite browser smoke at http://localhost:5176/ui/ with token injected from node-served UI: Hello World VM empty state rendered, no duplicate generic empty widgets, no console/page/API errors.
• 900x500 resize probe: VM hero had no internal text overflow.
• Light-theme contrast spot-check after theme-aware surface fix: badge ~6.2:1, headline/title ~15.6:1, context ~4.6:1, body ~8.5:1.

Local Review

• Temporary local reviewers completed three rounds using .codex/review-prompt.md and .codex/review-schema.json.
• Fixed valid findings: empty-VM branch preserved footer, LayerContent empty-VM behavior gained coverage, and VM hero styling became light-theme safe.
• Final review round returned {comments:[]}.

[github-actions]

Codex review completed — no issues found.

[github-actions]

Codex review completed — no issues found.