Session 241: Complete TypeScript migration for all 19 non-component files

Converted all utilities, hooks, contexts, services, and data files from JS to TS.
Added tsconfig.json, vite-env.d.ts, TypeScript dev dependencies.
19 .ts files with 50+ exported interfaces. Type-check clean. 3577 tests pass.

Co-authored-by: Stan2032 <68326386+Stan2032@users.noreply.github.com>

Author: Copilot

src/services/pushService.ts

@@ -83,7 +83,7 @@ export async function subscribeToPush(
       // Create new subscription
       subscription = await registration.pushManager.subscribe({
         userVisibleOnly: true,
-        applicationServerKey: urlBase64ToUint8Array(vapidKey),
+        applicationServerKey: urlBase64ToUint8Array(vapidKey) as BufferSource,
       });
     }
 

src/services/supabaseService.ts

@@ -69,7 +69,11 @@ export interface FetchRowsOptions {
   ascending?: boolean;
 }
 
-const NOT_CONFIGURED: SupabaseResult = { data: null, error: 'Supabase is not configured. Set VITE_SUPABASE_URL and VITE_SUPABASE_ANON_KEY.' };
+const NOT_CONFIGURED: SupabaseResult & PaginatedResult = {
+  data: null,
+  error: 'Supabase is not configured. Set VITE_SUPABASE_URL and VITE_SUPABASE_ANON_KEY.',
+  count: null,
+};
 
 // ─── INCIDENT REPORTS ────────────────────────────────────────────────
 

src/utils/encryption.ts

@@ -95,7 +95,7 @@ async function encryptValue(aesKey: CryptoKey, plaintext: string): Promise<Encry
   );
   return {
     ciphertext: arrayBufferToBase64(encrypted),
-    iv: arrayBufferToBase64(iv),
+    iv: arrayBufferToBase64(iv.buffer),
   };
 }
 
@@ -152,7 +152,7 @@ export async function encryptSubmission(
 
 // ─── Helpers ──────────────────────────────────────────────────────────
 
-function arrayBufferToBase64(buffer: ArrayBuffer): string {
+function arrayBufferToBase64(buffer: ArrayBuffer | ArrayBufferLike): string {
   const bytes = new Uint8Array(buffer);
   let binary = '';
   for (let i = 0; i < bytes.length; i++) {

src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />