Add Cypher grammar auto-completion to query editor

[Anchel123]

[overcut-ai]

Completed Working on "Automated Ticket Triage "

✅ Ticket triage completed for #1871. Applied labels: feature, duplicate. Duplicate identified: #1686 (#1686) with similarity 0.82. needs-info was not applied because no additional information was required to classify and de-duplicate.

✅ Workflow completed successfully.

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