Quote table identifiers for CSV and JSON exports

[swhan0329]

/claim #59

Summary

• quote table identifiers in the shared getTableData() data query used by CSV and JSON exports
• preserve the existing parameterized sqlite_master existence check
• add regression coverage for table names containing a quote and for reserved table names like order

This is a separate, scoped follow-up to the SQL dump identifier fix and avoids the broader streaming/R2 export implementations.

Verification

• pnpm exec vitest run src/export/index.test.ts src/export/csv.test.ts src/export/json.test.ts
• pnpm exec prettier --check src/export/index.ts src/export/index.test.ts
• git diff --check
• pnpm run build

Demo

• The focused tests verify that getTableData() keeps table existence lookup parameterized while emitting quoted SELECTs for kid's profiles and order.

[swhan0329]

Fresh local verification because this PR does not have GitHub checks attached:

• pnpm exec vitest run src/export/index.test.ts src/export/csv.test.ts src/export/json.test.ts -> 3 files / 20 tests passed
• pnpm exec prettier --check src/export/index.ts src/export/index.test.ts -> passed
• git diff --check -> passed
• pnpm run build -> passed

This remains scoped to quoting table identifiers in the shared CSV/JSON getTableData() data query while preserving the existing parameterized sqlite_master existence check.