fix(client): ignore stale SQL parser results

[HandSonic]

Related issue

N/A - no matching issue was found.

Summary

SQL parser responses had no ownership over the current editor model/SQL/database. Older responses could overwrite statements, markers, completion, decorations, and hints, while single-statement execution paths could read stale statement refs during the debounce window. This change adds scoped parser generations, clears invalidated state, requires every single-statement entry to await a committed quick parse, and binds toolbar/shortcut execution to trigger-time selection and cursor snapshots.

Affected surfaces

• Frontend / Web
• Backend / API / Storage
• Database plugin / Driver
• JCEF / Desktop packaging
• CI / Build / Release
• Documentation only

Verification

• Commands and results:
  • Ownership/execution tests passed for reverse completion, empty/unmount, DB/model/ABA, stale toolbar/quick execution, and cursor/selection movement during deferred parsing.
  • SQL completion plus related execution snapshot, Monaco, and shortcut contracts: passed.
  • Targeted ESLint: passed.
  • Full Community prebuild, Webpack, and production bundle verifier: passed.
  • Fork code and CodeQL checks: passed.
  • Merge-tree with fix(sql-parser): load cross-db table columns for the identifier's db/schema #2482 and this repair batch: passed.
• Manual verification: N/A - deferred parser promises model all response orders without a browser.
• UI evidence: N/A

Risk and compatibility

• Public API or stored data: No API or stored editor data changes.
• Database or driver compatibility: N/A.
• Network, privacy, or security: Prevents executing a statement parsed from obsolete editor content.
• Community / Local / Pro boundary: Shared Community SQL editor.
• Backward compatibility: Latest parser results preserve existing statements, markers, and hint behavior.

Reviewer map

• Start here: SqlParserRequestCoordinator, handleSQLParserRightNow, and both single-execution handlers.
• Failure condition: stale parser side effects commit or any execution path reads refs before a committed parse.
• Rollback or disable path: Revert commit 7d9989f9c6806fcf6da6244fda994ad8fffb25d0; no migration is required.

Contributor declaration

• I linked the Issue that defines this change.
• I tested the affected behavior and reported the actual results above.
• I did not include credentials, private data, or generated build output.
• I disclosed substantial AI assistance below, or this PR contains no substantial AI-generated code.

AI assistance: OpenAI Codex assisted with diagnosis, implementation, deterministic tests, verification, and adversarial review.

Latest-main revalidation (2026-09-04)

• Rebased onto upstream 144a04e; current head 7d9989f.
• Explicit parser-owner and SQL completion tests passed; targeted ESLint passed.
• Included in a 10-PR combined Community prebuild, Umi/Webpack production build, and bundle verification, all green.