Consolidates and renames the app title

src/lib/components/TopBar.svelte

@@ -2,8 +2,9 @@
     import {push} from 'svelte-spa-router'
     import {auth, clearTokens} from '../stores/auth.svelte'
     import {apiLogout} from '../api/index'
+    import {APP_NAME} from '../config'
 
-    let { title = 'Scavenger Hunt' }: { title?: string } = $props()
+    let { title = APP_NAME }: { title?: string } = $props()
 
   async function handleLogout() {
     try {

src/lib/config.ts

@@ -0,0 +1,2 @@
+// If you change this, also change it in `index.html`
+export const APP_NAME = 'Scrounge Quest'