feat(finance-table): enhance task display and localization support

- Added a new message for "No tasks found" in English, Spanish, and Portuguese localization files.
- Updated the finance table component to conditionally render a message when no tasks are available, improving user experience.
- Introduced a new CSS file for finance table styles to enhance visual consistency.
- Refactored the finance table rendering logic to handle task presence more effectively.

worklenz-frontend/public/locales/en/project-view-finance.json

@@ -20,6 +20,7 @@
     "totalActualCostColumn": "Total Actual Cost",
     "varianceColumn": "Variance",
     "totalText": "Total",
+    "noTasksFound": "No tasks found",
   
     "addRoleButton": "+ Add Role",
     "ratecardImportantNotice": "* This rate card is generated based on the company's standard job titles and rates. However, you have the flexibility to modify it according to the project. These changes will not impact the organization's standard job titles and rates.",