feat(project-currency): implement project-specific currency support

- Added a currency column to the projects table to allow different projects to use different currencies.
- Updated existing projects to default to 'USD' if no currency is set.
- Enhanced project finance controller to handle currency retrieval and updates.
- Introduced API endpoints for updating project currency with validation.
- Updated frontend components to display and manage project currency effectively.

worklenz-frontend/src/pages/projects/projectView/finance/project-view-finance.tsx

@@ -7,6 +7,7 @@ import { useAppDispatch } from '@/hooks/useAppDispatch';
 import { useAppSelector } from '@/hooks/useAppSelector';
 import { fetchProjectFinances, setActiveTab, setActiveGroup } from '@/features/projects/finance/project-finance.slice';
 import { changeCurrency, toggleImportRatecardsDrawer } from '@/features/finance/finance-slice';
+import { updateProjectCurrency } from '@/features/project/project.slice';
 import { projectFinanceApiService } from '@/api/project-finance-ratecard/project-finance.api.service';
 import { RootState } from '@/app/store';
 import FinanceTableWrapper from './finance-tab/finance-table/finance-table-wrapper';
@@ -14,14 +15,16 @@ import RatecardTable from './ratecard-tab/reatecard-table/ratecard-table';
 import ImportRatecardsDrawer from '@/features/finance/ratecard-drawer/import-ratecards-drawer';
 import { useAuthService } from '@/hooks/useAuth';
 import { hasFinanceEditPermission } from '@/utils/finance-permissions';
+import { CURRENCY_OPTIONS, DEFAULT_CURRENCY } from '@/shared/constants/currencies';
 
 const ProjectViewFinance = () => {
   const { projectId } = useParams<{ projectId: string }>();
   const dispatch = useAppDispatch();
   const { t } = useTranslation('project-view-finance');
   const [exporting, setExporting] = useState(false);
+  const [updatingCurrency, setUpdatingCurrency] = useState(false);
   
-  const { activeTab, activeGroup, loading, taskGroups } = useAppSelector((state: RootState) => state.projectFinances);
+  const { activeTab, activeGroup, loading, taskGroups, project: financeProject } = useAppSelector((state: RootState) => state.projectFinances);
   const { refreshTimestamp, project } = useAppSelector((state: RootState) => state.projectReducer);
   const phaseList = useAppSelector((state) => state.phaseReducer.phaseList);
 
@@ -30,6 +33,12 @@ const ProjectViewFinance = () => {
   const currentSession = auth.getCurrentSession();
   const hasEditPermission = hasFinanceEditPermission(currentSession, project);
 
+  // Get project-specific currency from finance API response, fallback to project reducer, then default
+  const projectCurrency = (financeProject?.currency || project?.currency || DEFAULT_CURRENCY).toLowerCase();
+
+  // Show loading state for currency selector until finance data is loaded
+  const currencyLoading = loading || updatingCurrency || !financeProject;
+
   useEffect(() => {
     if (projectId) {
       dispatch(fetchProjectFinances({ projectId, groupBy: activeGroup }));
@@ -71,6 +80,30 @@ const ProjectViewFinance = () => {
     }
   };
 
+  const handleCurrencyChange = async (currency: string) => {
+    if (!projectId || !hasEditPermission) {
+      message.error('You do not have permission to change the project currency');
+      return;
+    }
+
+    try {
+      setUpdatingCurrency(true);
+      const upperCaseCurrency = currency.toUpperCase();
+      await projectFinanceApiService.updateProjectCurrency(projectId, upperCaseCurrency);
+      
+      // Update both global currency state and project-specific currency
+      dispatch(changeCurrency(currency));
+      dispatch(updateProjectCurrency(upperCaseCurrency));
+      
+      message.success('Project currency updated successfully');
+    } catch (error) {
+      console.error('Currency update failed:', error);
+      message.error('Failed to update project currency');
+    } finally {
+      setUpdatingCurrency(false);
+    }
+  };
+
   const groupDropdownMenuItems = [
     { key: 'status', value: 'status', label: t('statusText') },
     { key: 'priority', value: 'priority', label: t('priorityText') },
@@ -130,13 +163,11 @@ const ProjectViewFinance = () => {
               <Flex gap={8} align="center">
                 <Typography.Text>{t('currencyText')}</Typography.Text>
                 <Select
-                  defaultValue={'lkr'}
-                  options={[
-                    { value: 'lkr', label: 'LKR' },
-                    { value: 'usd', label: 'USD' },
-                    { value: 'inr', label: 'INR' },
-                  ]}
-                  onChange={(value) => dispatch(changeCurrency(value))}
+                  value={projectCurrency}
+                  loading={currencyLoading}
+                  disabled={!hasEditPermission}
+                  options={CURRENCY_OPTIONS}
+                  onChange={handleCurrencyChange}
                 />
               </Flex>
               <Button