358 dev cashflow implementation

[janekamata]

ℹ️ Issue

Closes #358

📝 Description

Implemented frontend for cash flow page - not connected to store/backend

Briefly list the changes made to the code:

1. Set up all major components for the cash flow page
2. Added list of revenue/costs to store
3. Minor styling fixes

✔️ Verification

What steps did you take to verify your changes work? These should be clear enough for someone to be able to clone the branch and follow the steps themselves.

Testing on frontend

Provide screenshots of any new components, styling changes, or pages.

Test Changes

If your new feature required some test to be changed or added to fit the new functionality or changes please document these changes here.

🏕️ (Optional) Future Work / Notes

• Adding starting cash position, annual increase settings to backend/middleware/store
• Setting up middleware actions with backend/frontend
• Connecting data to backend
  • Implementing add/edit/remove for line items including frontend edit
  • Implementing edit for cash position/increase settings
  • Aggregation/live data for chart, kpi cards