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/tribute.ts

@@ -51,6 +51,7 @@ function makeCollections({mentions, emoji}) {
 export async function attachTribute(element, {mentions, emoji}) {
   const {default: Tribute} = await import(/* webpackChunkName: "tribute" */'tributejs');
   const collections = makeCollections({mentions, emoji});
+  // @ts-expect-error TS2351: This expression is not constructable (strange, why)
   const tribute = new Tribute({collection: collections, noMatchTemplate: ''});
   tribute.attach(element);
   return tribute;