Clean CodeQL quality findings

[Ryson-32]

Summary

• remove unused imports and local variables reported by CodeQL
• rename repeated test hook/result snapshots to avoid useless-assignment findings
• keep runtime behavior unchanged; no release, tag, or deploy

Validation

• git diff --check
• npm run test:unit -- packages/ui/src/product/converter/advanced-mode/sections/proxy-groups-rules-search.test.ts packages/ui/src/product/converter/advanced-mode/sections/node-management/bulk-edit-dialog.test.ts packages/ui/src/product/converter/advanced-mode/sections/proxy-groups-module-rules-panel.test.ts
• npm run local:typecheck
• npm run lint
• npm run local:build
• npm run test:unit