feat(trace-ui): add session lineage navigation

[alectimison-maker]

Summary

Adds persisted-run session hierarchy navigation to the Traces page while keeping the existing run detail surface intact.

Closes #2900

What changed

• Added a browser-neutral lineage builder shared by Chrome and Firefox.
• Groups loaded runs by session and keeps groups collapsed by default.
• Shows deterministic parent/child navigation using parentRunId when the unique parent is present in the loaded result.
• Keeps duplicate IDs, missing parents, cycles, and cross-session relationships visible as root records with explanatory markers.
• Shows an incomplete-lineage notice when the list is bounded, filtered, or contains unresolved relationships.
• Preserves run selection, timeline, statistics, trajectory, comparison, export, refresh, and automatic refresh behavior.
• Added localized labels for all shipped UI languages.

Design notes

• Parent attachment is limited to an unambiguous parent in the current loaded result.
• Siblings are ordered by startedAt, then runId.
• Cross-session relationships remain visible as references; they are not represented as same-session parent links.
• No event format, persisted storage schema, or telemetry exporter behavior is changed.

Validation

• node test/run.js — 2026 passed; 2 pre-existing failures remain in the repository version-history and tracked-archive checks.
• npm run test:toolbar-guard — 33/33 passed.
• npm run test:security — 60/60 passed.
• node scripts/benchmark-offline-relevance.mjs — completed successfully.
• Chrome/Firefox source parity and JavaScript syntax checks passed.
• Manual unpacked-extension interaction testing was not available in this environment.

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