Port the color picker popover to a Rust-defined layout (#4102)

* Break out VisualColorPickersInput.svelte

* Break out ColorComparisonInput.svelte and ColorPresetsInput.svelte

* Add backend definitions and plumbing for the 4 new widgets

* Port the ColorPicker.svelte layout and business logic to Rust

* Port more ColorComparisonInput.svelte logic to Rust

* Port more SpectrumInput.svelte logic to Rust

* Port more frontend logic to Rust

* Code review

* Code review

* Fix some CSS

frontend/src/components/Editor.svelte

@@ -9,6 +9,7 @@
 	import { createPanicManager, destroyPanicManager } from "/src/managers/panic";
 	import { createPersistenceManager, destroyPersistenceManager } from "/src/managers/persistence";
 	import { createAppWindowStore, destroyAppWindowStore } from "/src/stores/app-window";
+	import { createColorPickerStore, destroyColorPickerStore } from "/src/stores/color-picker";
 	import { createDialogStore, destroyDialogStore } from "/src/stores/dialog";
 	import { createDocumentStore, destroyDocumentStore } from "/src/stores/document";
 	import { createFullscreenStore, destroyFullscreenStore } from "/src/stores/fullscreen";
@@ -32,6 +33,7 @@
 		nodeGraph: createNodeGraphStore(subscriptions),
 		portfolio: createPortfolioStore(subscriptions, editor),
 		appWindow: createAppWindowStore(subscriptions),
+		colorPicker: createColorPickerStore(subscriptions),
 	};
 	Object.entries(stores).forEach(([key, store]) => setContext(key, store));
 
@@ -61,6 +63,7 @@
 		destroyNodeGraphStore();
 		destroyPortfolioStore();
 		destroyAppWindowStore();
+		destroyColorPickerStore();
 
 		// Managers
 		destroyClipboardManager();