Switching ui lib & refactoring (#80)

switch to shadcn ui
bump runtime versions (node, pnpm, etc)
refactor gui

src/lib/components/ui/alert/alert.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+  import { cn } from '$lib/utils'
+  import type { HTMLAttributes } from 'svelte/elements'
+  import { alertVariants, type Variant } from '.'
+
+  type $$Props = HTMLAttributes<HTMLDivElement> & {
+    variant?: Variant
+  }
+
+  let className: $$Props['class'] = undefined
+  export let variant: $$Props['variant'] = 'default'
+  export { className as class }
+</script>
+
+<div
+  class={cn(alertVariants({ variant }), className)}
+  {...$$restProps}
+  role="alert"
+>
+  <slot />
+</div>