feat:standardize timestampp formatting across componetns

[Faith-okereke]

Pull Request

Summary

Standardize timestamp formatting across all dashboard tables using date-fns

Type of Change

• Feature
• Bug Fix
• Refactoring
• Documentation
• Tests
• Infrastructure / CI

Linked Issues

Closes #435

Key Changes

• New Utility Module ([date.ts]
  [formatDate()]- Basic formatting
  [formatDateRange()]- Date ranges
  [formatDateTime()] Date with time
  Other helpers for flexible formatting

• Updated 8 Components:

Finance: NairaTransactionHistory
Team Management: Timeoff, Time Tracking, Milestone, Expense, ContractCard
Contracts: ContractHistory
Invoices: InvoiceDetailsSection
Result:

• All dashboard tables now display clean, human-readable dates
  -Easy to maintain - change formatting in one utility file to update everywhere
  -Type-safe with date-fns library

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new linting/type-checking warnings.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the documentation accordingly.

[vercel]

@Faith-okereke is attempting to deploy a commit to the vestroll's projects Team on Vercel.

A member of the Team first needs to authorize it.

[codeZe-us]

@Faith-okereke i left a comment on your PR and also fix conflict in your branch

[Faith-okereke]

@Faith-okereke i left a comment on your PR and also fix conflict in your branch

I have resolved conflicts now