Bootstrap Image Generator application (#53)

This PR begins scaffolding the Stable Diffusion Turbo application (title
TBD), which is a separate frontend for Storyteller Engine which focuses
on image generation.

### Design Overview

* The application renders a "split-screen" view, with Storyteller Studio
  on the left, and the Stable Diffusion Turbo output on the right
* When changes are made in the Studio editor:
  - A screenshot is taken from the Bevy application
  - Screenshot is piped into Stable Diffusion Turbo model
  - Model output is rendered to the screen
* This all happens in as close to real-time as possible

### Work completed in this PR

* The `studio-frontend` project has been (somewhat crudely) refactored
  to split most of its components into reusable libraries
  - `studio-ui` is a use-case-agnostic design system library for core UI
    components. These are "dumb" components which are controlled
    via `@property` inputs and send `CustomEvent`s in response to user
    input.
  - `studio-frontend` is a collection of reusable Storyteller Studio
    widgets. These are "smart" components which depend on
    `@storyteller/studio` directly, manage their own state, and require very
    little configuration or styling. They are designed to be drop-in
    building blocks that can be reused between various frontends.
* The new application has been bootstrapped as `image-generator-demo`
  - Currently, this simply grabs screenshots from the Bevy application and
    renders those screenshots on the right side of the split-screen view. A
    future PR will wire up to the Storyteller.ai backend to pipe these
    screenshots through Stable Diffusion Turbo, and render that model's
    output instead.

### Testing

* Install dependencies as described in the repo's README
* Run `npx nx serve image-generator-demo`
* Open [localhost:4200](http://localhost:4200) in your browser
  - Use the camera controller in the left side of the view to manipulate
    the Bevy scene
  - Verify the right side of the view updates with a fresh screenshot at a
    rate of ~5 fps
* Toggle the "Realtime Capture" checkbox
  - Verify the right side view no longer updates while the user is
    actively manipulating the editor
  - This should allow the app to run smoother on lower-spec hardware

---------

Co-authored-by: Danny McGee <dannymcgee@gmail.com>

studio/scripts/build-web.mjs

@@ -13,6 +13,12 @@ async function main() {
 		const __dirname = url.fileURLToPath(new URL(".", import.meta.url));
 		const workspaceRoot = path.resolve(__dirname, "../..");
 
+		const extraCargoArgs = process.argv.slice(2);
+		console.log(`Extra cargo args:`);
+		for (let arg of extraCargoArgs) {
+			console.log(`   ${arg}`);
+		}
+
 		/** @type import("node:child_process").StdioOptions */
 		const stdio = ["ignore", "inherit", "inherit"];
 
@@ -26,9 +32,8 @@ async function main() {
 			"-p", "studio",
 			"--lib",
 			"--release",
-			"--features", "wasm",
 			"--target", "wasm32-unknown-unknown",
-		], {
+		].concat(extraCargoArgs), {
 			shell: true,
 			cwd: workspaceRoot,
 			stdio,