feat: build automated export and reporting generator for agent financial activity

[temisan0x]

Closes #78

Summary

Implements a reporting dashboard for generating, previewing, and exporting CSV/JSON financial reports of agent transactions and budget allocations over custom date ranges. Runs fully client-side with no server dependency in mock mode.

What I changed

• FinancialReportExporter.tsx — report generator UI: date range picker, column selection, CSV/JSON format toggle, progress indicator during compilation
• reportExport.ts — client-side serialization utilities for CSV/JSON export
• reports/page.tsx — wired the exporter into a dedicated reports route
• transactions/page.tsx — removed dead/unused columns array left over from prior work

Acceptance checklist

• Report generator UI: date range + field selection
• Export triggers browser download of correctly formatted CSV/JSON
• Empty dataset handled gracefully
• npm run typecheck, npm run lint, npm run build pass

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #78.
Verdict: clean

The PR successfully implements the automated export and reporting generator for agent financial activity matching all requirements.

Reviewed commit: 25ec7ea93319b5a60f4585d81f0f1532389ca8dd.
CI and merge eligibility are checked separately.

[mergekeeper]

Approved

The pull request successfully implements the automated export and reporting generator component, utility functions, and page integration as specified in the linked issue.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: mergeable
Checked commit: 25ec7ea93319b5a60f4585d81f0f1532389ca8dd.

Reason:
GitHub pull request merge request failed with 405: 3 of 3 required status checks have not succeeded: 2 expected.

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[mergekeeper]

Approved

The pull request successfully implements the automated export and reporting generator for agent financial activity in accordance with the issue requirements.

[mergekeeper]

Approved

The PR successfully implements the automated export and reporting generator for agent financial activity in full accordance with the requirements.

[mergekeeper]

Approved

The PR successfully implements the automated export and reporting generator for agent financial activity matching all requirements.