Refactor duplicated authentication and date formatting logic

[Copilot]

Eliminates repeated authentication checks and date formatting patterns across the repair module by extracting shared utilities.

Changes

Created src/utils/repair.ts

• validateRepairRole() - Role validation logic
• checkAuthAndRedirect() - Authentication with automatic login redirect
• requireRepairRole() - Combined auth + role check

Created src/utils/date.ts

• formatDateTime(), formatDate(), formatShortDateTime() - Standardized date formatting

Refactored 6 components to use shared utilities:

• RepairAdmin.tsx, EventDetail.tsx, RepairHistoryCard.tsx
• RepairHistoryPage.tsx, TicketDetail.tsx, TicketForm.tsx

Before/After

// Before: Repeated in 5 files
const authenticated = await makeLogtoClient().isAuthenticated()
if (!authenticated) {
  window.location.href = `/repair/login-hint?redirectUrl=${path}`
  return
}
const res = await makeLogtoClient().getIdTokenClaims()

// After: Single call
const userInfo = await checkAuthAndRedirect(path)

// Before: Repeated in 4 files
dayjs(event.gmtCreate).format("YYYY-MM-DD HH:mm")

// After: Consistent formatting
formatDateTime(event.gmtCreate)

Impact: -66 duplicated lines, +122 reusable utility lines across 8 files

Original prompt

Find and refactor duplicated code

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