fix(twenty-front): fix tsconfig to properly typecheck all files with tsgo (#17380)

## Summary

This PR fixes the `tsconfig` setup in `twenty-front` so that `tsgo -p
tsconfig.json` properly type-checks all files.

### Root Cause

The previous setup used TypeScript project references with `files: []`
in the main `tsconfig.json`. When running `tsgo -p tsconfig.json`, this
checks nothing because `tsgo` requires the `-b` (build) flag for project
references, but the configs weren't set up for composite mode.

### Changes

**Simplified tsconfig architecture (4 files → 2):**
- `tsconfig.json` - All files (dev, tests, stories) for
typecheck/IDE/lint
- `tsconfig.build.json` - Production files only (excludes tests/stories)

**Removed redundant configs:**
- `tsconfig.dev.json`
- `tsconfig.spec.json` 
- `tsconfig.storybook.json`

**Updated references:**
- `jest.config.mjs` → uses `tsconfig.json`
- `eslint.config.mjs` → uses `tsconfig.json`
- `vite.config.ts` → uses `tsconfig.json` for dev

**Type fixes (pre-existing errors revealed by proper typechecking):**
- Made `applicationId` optional in `FieldMetadataItem` and
`ObjectMetadataItem`
- Added missing `navigationMenuItem` translation
- Added `objectLabelSingular` to Search GraphQL query
- Fixed `sortMorphItems.test.ts` mock data

## Test plan

- [ ] Run `npx nx typecheck twenty-front` - should pass
- [ ] Run `npx nx lint twenty-front` - should work
- [ ] Run `npx nx test twenty-front` - should work
- [ ] Run `npx nx build twenty-front` - should work
- [ ] Verify IDE type checking works correctly

packages/twenty-shared/src/utils/validation/normalizeLocale.ts

@@ -1,13 +1,14 @@
-import { APP_LOCALES, SOURCE_LOCALE } from '@/translations';
+import {
+  APP_LOCALES,
+  type AppLocale,
+} from '@/translations/constants/AppLocales';
+import { SOURCE_LOCALE } from '@/translations/constants/SourceLocale';
 
-/**
- * Maps language codes to full locale keys in APP_LOCALES
- * Example: 'fr' -> 'fr-FR', 'en' -> 'en'
- */
+// Maps language codes to full locale keys in APP_LOCALES
+// Example: 'fr' -> 'fr-FR', 'en' -> 'en'
 const languageToLocaleMap = Object.keys(APP_LOCALES).reduce<
   Record<string, string>
 >((map, locale) => {
-  // Extract the language code (part before the hyphen or the whole code if no hyphen)
   const language = locale.split('-')[0].toLowerCase();
 
   // Only add to the map if not already added or if the current locale is the source locale
@@ -20,19 +21,14 @@ const languageToLocaleMap = Object.keys(APP_LOCALES).reduce<
   return map;
 }, {});
 
-/**
- * Normalizes a locale string to match our supported formats
- */
-export const normalizeLocale = (
-  value: string | null,
-): keyof typeof APP_LOCALES => {
+export const normalizeLocale = (value: string | null): AppLocale => {
   if (value === null) {
     return SOURCE_LOCALE;
   }
 
   // Direct match in our supported locales
   if (value in APP_LOCALES) {
-    return value as keyof typeof APP_LOCALES;
+    return value as AppLocale;
   }
 
   // Try case-insensitive match (e.g., 'fr-fr' -> 'fr-FR')
@@ -40,13 +36,13 @@ export const normalizeLocale = (
     (locale) => locale.toLowerCase() === value.toLowerCase(),
   );
   if (caseInsensitiveMatch) {
-    return caseInsensitiveMatch as keyof typeof APP_LOCALES;
+    return caseInsensitiveMatch as AppLocale;
   }
 
   // Try matching just the language part (e.g., 'fr' -> 'fr-FR')
   const languageCode = value?.trim() ? value.split('-')[0].toLowerCase() : '';
   if (languageToLocaleMap[languageCode]) {
-    return languageToLocaleMap[languageCode] as keyof typeof APP_LOCALES;
+    return languageToLocaleMap[languageCode] as AppLocale;
   }
 
   return SOURCE_LOCALE;