refactor(format): add moment import and fix money function types

- Add explicit moment import to fix TypeScript UMD global error
- Simplify money() to consistently return defaultValue for null/undefined/0
- Update tests to reflect new behavior

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: talissoncosta

frontend/common/utils/__tests__/format.test.ts

@@ -198,8 +198,14 @@ describe('Format', () => {
       expect(Format.money(0, 'N/A')).toBe('N/A')
     })
 
-    it('should return null for null value', () => {
-      expect(Format.money(null)).toBe(null)
+    it('should return FREE for null/undefined values', () => {
+      expect(Format.money(null)).toBe('FREE')
+      expect(Format.money(undefined)).toBe('FREE')
+    })
+
+    it('should return custom default value for null/undefined', () => {
+      expect(Format.money(null, 'N/A')).toBe('N/A')
+      expect(Format.money(undefined, 'N/A')).toBe('N/A')
     })
   })
 

frontend/common/utils/format.ts

@@ -1,3 +1,5 @@
+import moment from 'moment'
+
 type Person = {
   firstName?: string
   lastName?: string
@@ -129,18 +131,15 @@ const Format = {
     value: number | null | undefined,
     defaultValue?: string | null,
   ): string | null | undefined {
-    if (value === 0) {
+    if (value === null || value === undefined || value === 0) {
       return defaultValue == null ? 'FREE' : defaultValue
     }
 
-    return (
-      value &&
-      `£${value
-        .toFixed(2)
-        .replace(/./g, (c, i, a) =>
-          i && c !== '.' && (a.length - i) % 3 === 0 ? `,${c}` : c,
-        )}`
-    )
+    return `£${value
+      .toFixed(2)
+      .replace(/./g, (c, i, a) =>
+        i && c !== '.' && (a.length - i) % 3 === 0 ? `,${c}` : c,
+      )}`
   },
 
   monthAndYear(value: string | null | undefined): string | null | undefined {