Feature: Allow users to create personal expenses (without requiring a group) #7
Description
Enable users to record expenses that only involve themselves (personal/out-of-pocket expenses) directly, without forcing creation of a group first.
Current flow:
Expense creation requires selecting/creating a group → even for solo use
New flow:
- Add "Personal Expense" / "Myself" option at expense creation
- When selected → no participants/group needed, expense belongs to the user only
- Still supports category, amount, date, note etc.
- Personal expenses visible only to the creating user (in their dashboard / personal expenses tab)