Update UI

[laurakwhit]

What was changed

This PR fixes/updates the UI in the extension webview with the use of the Webview UI Toolkit for Visual Studio Code and Visual Studio Code icons via svelte-codicons.

Before	After (Dark)	After (Light)

[CLAassistant]

All committers have signed the CLA.

[bergundy]

Looks like now if I try to debug a workflow the second time, the tab doesn't switch to the history view.

[bergundy]

Yup, history is not refreshed.

[bergundy]

For some reason, sometimes when I click on the "choose file" button nothing happens now, can't reliably reproduce this.

[laurakwhit]

Looks like now if I try to debug a workflow the second time, the tab doesn't switch to the history view. Yup, history is not refreshed.

@bergundy thanks for the feedback! I've made some updates, including a fix for ☝️

For some reason, sometimes when I click on the "choose file" button nothing happens now, can't reliably reproduce this.

I couldn't reproduce, but let me know if you encounter it again. Wondering if there's something off with a click or submit event handler somewhere 🤔

[laurakwhit]

The file inputs don't work for me

@bergundy is finder not opening? Or is it another issue? I'm unable to reproduce and would like to get to the bottom of any issues before merging 😅

[bergundy]

Yeah, finder is not opening. Didn’t dig deeper. I’ll try to get info from the dev console.

[bergundy]

2 things:

1. I don't know why I'm working now
2. I upgraded vscode and it resolved the issue 🤷