`null`, property names in js/ts code is not highlighted like it is in vscode (which is better)

I notice some differences between the plugin on each IDE. I find VSCode's more varied and 'correct'

- property names are white in vscode but blue in zed. it makes them hard to tell apart from class properties.
- ~~the `this` keyword is red in vscode, but purple in zed. it makes it hard to spot that very important keyword FIXED~~
- the `null` keyword is purple in vscode, but orange in zed. which means that the a number like 3, and a value like `null` are not differentiated enough

VSCode:

Zed

Start by comparing the JavaScript and TypeScript highlighting shown in the VSCode and Zed screenshots, focusing on property names and the `null` keyword. Trace the Zed theme configuration or highlighting entry point that controls those colors, and consider the issue done when those tokens are visually differentiated like the VSCode examples.

Written by the indexing model from the issue text.