Fix remaining typescript issues, enable tsc (#32840)

Fixes 79 typescript errors. Discovered at least two bugs in
`notifications.ts`, and I'm pretty sure this feature was at least
partially broken and may still be, I don't really know how to test it.

After this, only like ~10 typescript errors remain in the codebase but
those are harder to solve.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/oauth2-settings.ts

@@ -1,5 +1,7 @@
 export function initOAuth2SettingsDisableCheckbox() {
-  for (const e of document.querySelectorAll('.disable-setting')) e.addEventListener('change', ({target}) => {
-    document.querySelector(e.getAttribute('data-target')).classList.toggle('disabled', target.checked);
-  });
+  for (const el of document.querySelectorAll('.disable-setting')) {
+    el.addEventListener('change', (e: Event & {target: HTMLInputElement}) => {
+      document.querySelector(e.target.getAttribute('data-target')).classList.toggle('disabled', e.target.checked);
+    });
+  }
 }