feat(api): add enum validation utility for improved type safety

- Introduced `isValidEnumValue` and `validateEnumValue` functions to validate enum values, enhancing type safety in the application.
- Updated `DisplayService` to utilize `validateEnumValue` for theme and unit properties, ensuring only valid enum values are assigned.

api/src/core/utils/validation/enum-validator.ts

@@ -0,0 +1,17 @@
+export function isValidEnumValue<T extends Record<string, string | number>>(
+    value: unknown,
+    enumObject: T
+): value is T[keyof T] {
+    if (value == null) {
+        return false;
+    }
+
+    return Object.values(enumObject).includes(value as T[keyof T]);
+}
+
+export function validateEnumValue<T extends Record<string, string | number>>(
+    value: unknown,
+    enumObject: T
+): T[keyof T] | undefined {
+    return isValidEnumValue(value, enumObject) ? (value as T[keyof T]) : undefined;
+}

api/src/unraid-api/graph/resolvers/info/display/display.service.ts

@@ -6,6 +6,7 @@ import { type DynamixConfig } from '@app/core/types/ini.js';
 import { toBoolean } from '@app/core/utils/casting.js';
 import { fileExists } from '@app/core/utils/files/file-exists.js';
 import { loadState } from '@app/core/utils/misc/load-state.js';
+import { validateEnumValue } from '@app/core/utils/validation/enum-validator.js';
 import { getters } from '@app/store/index.js';
 import { ThemeName } from '@app/unraid-api/graph/resolvers/customization/theme.model.js';
 import { Display, Temperature } from '@app/unraid-api/graph/resolvers/info/display/display.model.js';
@@ -77,8 +78,8 @@ export class DisplayService {
         const display: Display = {
             id: 'info/display',
             case: caseInfo,
-            theme: config.theme || ThemeName.white,
-            unit: config.unit || Temperature.CELSIUS,
+            theme: config.theme ?? ThemeName.white,
+            unit: config.unit ?? Temperature.CELSIUS,
             scale: config.scale ?? false,
             tabs: config.tabs ?? true,
             resize: config.resize ?? true,
@@ -145,10 +146,11 @@ export class DisplayService {
         }
 
         const { theme, unit, ...display } = state.display;
+
         return {
             ...display,
-            theme: theme as ThemeName,
-            unit: unit as Temperature,
+            theme: validateEnumValue(theme, ThemeName),
+            unit: validateEnumValue(unit, Temperature),
             scale: toBoolean(display.scale),
             tabs: toBoolean(display.tabs),
             resize: toBoolean(display.resize),