Remove redundant refetch() calls causing race conditions

[Copilot]

The onSuccess handlers for both mutations called invalidateQueries and then manually called refetch(). Since invalidateQueries already triggers an automatic refetch, the manual calls were redundant and could cause race conditions.

Changes

• Removed void imageUrls.refetch() from uploadMutation.onSuccess
• Removed void imageUrls.refetch() from deleteMutation.onSuccess

// Before
onSuccess: () => {
  console.log('File uploaded successfully')
  void queryClient.invalidateQueries({ queryKey: ['ALL_IMAGES'] })
  void imageUrls.refetch()  // Redundant - causes race condition
},

// After
onSuccess: () => {
  console.log('File uploaded successfully')
  void queryClient.invalidateQueries({ queryKey: ['ALL_IMAGES'] })
},

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