Enhance frontend-web with new features and dependencies

- Added new font support for 'Oxanium' and integrated Radix UI components including Dialog and Select.
- Updated CSS to set the default font to 'Oxanium Variable' and adjusted HTML font size.
- Introduced AddAccountDialog component for managing debt accounts, enhancing user experience.
- Refactored DebtsPage to utilize the new AddAccountDialog and improved account management features.
- Updated Redux store to support debt categories and accounts, including actions for adding, updating, and removing accounts.
- Mock data added for clients and invoices to facilitate development and testing.

frontend-web/package.json

@@ -11,7 +11,10 @@
   },
   "dependencies": {
     "@fontsource-variable/geist": "^5.2.8",
+    "@fontsource-variable/oxanium": "^5.2.8",
+    "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-label": "^2.1.8",
+    "@radix-ui/react-select": "^2.2.6",
     "@radix-ui/react-separator": "^1.1.8",
     "@radix-ui/react-slot": "^1.2.4",
     "@radix-ui/react-tooltip": "^1.2.8",