Add types for js globals (#31586)

Adds types for `window.config` and jQuery/htmx globals, eliminating 48
`tsc` errors.

web_src/js/htmx.ts

@@ -4,8 +4,8 @@ import {showErrorToast} from './modules/toast.ts';
 import 'idiomorph/dist/idiomorph-ext.js';
 
 // https://htmx.org/reference/#config
-htmx.config.requestClass = 'is-loading';
-htmx.config.scrollIntoViewOnBoost = false;
+window.htmx.config.requestClass = 'is-loading';
+window.htmx.config.scrollIntoViewOnBoost = false;
 
 // https://htmx.org/events/#htmx:sendError
 document.body.addEventListener('htmx:sendError', (event) => {

web_src/js/types.ts

@@ -0,0 +1,23 @@
+export type MentionValue = {
+  key: string,
+  value: string,
+  name: string,
+  fullname: string,
+  avatar: string,
+}
+
+export type Config = {
+  appUrl: string,
+  appSubUrl: string,
+  assetVersionEncoded: string,
+  assetUrlPrefix: string,
+  runModeIsProd: boolean,
+  customEmojis: Record<string, string>,
+  csrfToken: string,
+  pageData: Record<string, any>,
+  notificationSettings: Record<string, any>,
+  enableTimeTracking: boolean,
+  mentionValues?: MentionValue[],
+  mermaidMaxSourceCharacters: number,
+  i18n: Record<string, string>,
+}