- Include all src/types/*.d.ts files when typechecking with the main
   tsconfig.json config. Previously some of these were only included
   when using tsconfig.no-any.json.

 - Update our custom types for lodash.debounce to support arguments.
   This is needed by some of the `Thread*` components. I added the
   `leading` and `trailing` options for completeness, though we don't
   use them anywhere.

 - Add missing types in debounced callbacks in ThreadCard. These are now
   required due to the previous change.