Add missing app.d.ts file.

src/app.d.ts

+/// <reference types="@sveltejs/kit" />
+
+declare namespace App {
+  interface Locals {
+    user?: User
+  }
+
+  // interface Platform {}
+
+  interface Session {
+    advanced: boolean
+    apiBaseUrls: string[]
+    apiWebSocketBaseUrls: string[]
+    baseUrl: string
+    authenticationEnabled: boolean
+    childrenKey: string
+    familyEntityKey: string
+    hasGithubPersonalAccessToken: boolean
+    hiddenEntitiesKeyPlural?: string[]
+    matomo?: {
+      prependDomain?: boolean
+      siteId: number
+      subdomains?: string
+      url: string
+    }
+    openfiscaRepository: SessionOpenFiscaRepository
+    portalUrl: string
+    reformName?: string
+    showTutorial?: boolean
+    title: string
+    user?: User
+  }
+
+  interface SessionOpenFiscaRepository {
+    branch: string
+    group: string
+    project: string
+    rawUrlTemplate: string
+    urlTemplate: string
+  }
+
+  // interface Stuff {}
+
+  export interface User {
+    email: string // "john@doe.com"
+    email_verified: boolean
+    family_name: string // "Doe"
+    given_name: string // "John"
+    last_name: string // "Doe"
+    locale: string // "fr"
+    name: string // "John Doe"
+    preferred_username: string // "jdoe",
+    roles?: string[] // [ 'offline_access', 'default-roles-leximpact', 'uma_authorization' ],
+    sub: string // "12345678-9abc-def0-1234-56789abcdef0"
+  }
+}