feat: resolve #244 logging and monitoring and #250 export functionality

[KayProject]

Summary

• add structured logging with aggregation, level filtering, and request/performance metrics
• add export utilities for filtered and sorted exports
• add export progress UI with a reusable ExportButton
• update export execution flow and monitoring hooks
• add test coverage for logging and export utilities

Testing

• node ./node_modules/vitest/vitest.mjs run src/lib/logging/logger.test.ts src/lib/export/utils.test.ts src/lib/export-scheduler/tests/exporter.test.ts

Closes #244
Closes #250

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[RUKAYAT-CODER]

Kindly resolve conflict
If the package-lock conflicts are messy, resolve package.json first, delete package-lock.json, run npm install to regenerate it, test locally, then pull/rebase before pushing.