refactor mode.ts to use a single persistent store

[ollema]

No description provided.

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Latest commit: 97ee5c7

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[ollema]

passing all tests but I want to test with some actual apps as well

I have not created a changeset, the API remains largely unchanged except for the mode store - it now has three possible values (dark, light, system) just like the solution used in shadcn/ui instead of two (dark, light).

so if you like this change, not sure if this should be a patch or a minor change

[ollema]

also, note that:

/** Automatically set the visible light/dark updates on change */
 export function autoModeWatcher(): void {
 	const mql = window.matchMedia('(prefers-color-scheme: dark)');
 	function setMode(value: boolean) {
 		const htmlEl = document.documentElement;
 		const classDark = 'dark';
 		if (value === true) {
 			htmlEl.classList.remove(classDark);
 			htmlEl.style.colorScheme = 'light';
 		} else {
 			htmlEl.classList.add(classDark);
 			htmlEl.style.colorScheme = 'dark';
 		}
 	}
 	setMode(mql.matches);
 	mql.onchange = () => {
 		setMode(mql.matches);
 	};
 }

was removed. but that code was unused, both here and actually on the skeleton.dev page as well.

not sure if that was intentional. if we want auto watching functionality, I could work on that as well (to add this back and make the necessary changes to make it work again)

[ollema]

Closed in favor of #10