feat: build department budget allocation breakdown chart and table component

[temisan0x]

Summary

Implements DepartmentBudgetBreakdown with Recharts donut/bar chart and TanStack Table showing allocated/spent/remaining per department.

• Recharts donut/bar chart for budget allocation across departments
• TanStack Table with sortable columns
• Tooltips showing accurate numeric values and currency formatting
• Respects dark/light theme tokens in src/styles/tokens.css
• Responsive container, resizes correctly

Type of change

• New feature

Checklist

• Strict TypeScript type checking passes
• npm run typecheck && npm run lint

Closes #69

[vercel]

@temisan0x is attempting to deploy a commit to the Cjay's projects Team on Vercel.

A member of the Team first needs to authorize it.

[mergekeeper]

Needs review

Linked to #80, but the diff does not match the issue scope.

The pull request implements budget breakdown features instead of the required Stellar wallet transaction history table with export and filter controls.

Reviewed commit: 3b294fa53243c690209aa6bef45c5c2d529cee59.

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #69.
Verdict: clean

The department budget allocation component, types, and page integrations have been correctly implemented using Recharts and TanStack Table according to all acceptance criteria and repository patterns.

Reviewed commit: b23530d46de0514ead928ae0a3380d41664be129.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: mergeable
Checked commit: 67897fd5fb67ac6bc695a36dcbc4eda80e209528.

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

Next steps:
This required status check is enforced directly by the repository's branch rules, independent of MergeKeeper's own CI evaluation — a maintainer merge override cannot bypass it unless MergeKeeper is authorized to.

1. Wait for the check to pass, or fix the underlying failure.
2. To let an explicit override bypass this check going forward, add the MergeKeeper GitHub App as a Bypass actor on the ruleset (Settings → Rules → Rulesets → the ruleset → Bypass list).

[mergekeeper]

Approved

The pull request correctly implements the DepartmentBudgetBreakdown component, types, and integrations fulfilling all requirements.

[mergekeeper]

Approved

The department budget allocation component, types, and page integrations have been correctly implemented using Recharts and TanStack Table according to all acceptance criteria and repository patterns.

[mergekeeper]

Merged

Merged with squash.