Monthly Expense Filters, Group Spending Limits, UI Color Fix, and Premium Trial#16

I would like to suggest a few improvements and share some feedback about the app.

1. Expense filtering options
   It would be very useful to have filtering options for group expenses. For example, the ability to filter expenses from the last 7 days, last 30 days, etc.
   Additionally, it would be great to have the option to filter by specific months, not only by the last 30 days.
   Example: I manage monthly expenses with my girlfriend, and it would be helpful to see how much we spent in January, February, March, etc.
2. Spending limits / budgets for groups
   Another useful feature would be the ability to create spending limits, such as monthly or weekly limits, for a group.
   For example, users could set a limit where the total group expenses should not exceed a certain amount within a month, similar to the budgeting feature available in Wallet.
3. Group color behavior
   A small UI detail: when we change the color of a group, it currently changes the color of many menus across the app, not just the group itself.
   It might be better if the color change only affected the specific group, rather than the overall interface.
4. Premium trial suggestion
   Finally, a personal opinion regarding the premium model.
   The app can be very useful for shared expenses, and I understand that as a company you need to monetize it. However, I believe it could be beneficial to introduce a 30-day premium trial.
   This could encourage users to create groups with friends and start using the app together. After the trial period, users might decide to subscribe to keep the full experience, especially if they already have active groups.
   Since the main focus of the app is shared expense management, this approach could help increase adoption and long-term subscriptions.

Spending limits implemented. Ready to deploy