(feat) add user initials icon component

src/components/ui/user-icon/index.ts

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+import UserDefaultIcon from './user-default-icon.svelte'
+
+export { UserDefaultIcon }

src/components/ui/user-icon/user-default-icon.svelte

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+<script lang="ts">
+	export const firstname: string = 'Nomen'
+	export const lastname: string = 'Nescio'
+
+	function hashCode(str: string) {
+		let hash = 0
+		for (let i = 0, len = str.length; i < len; i++) {
+			let chr = str.charCodeAt(i)
+			hash = (hash << 3) - hash + chr
+			hash |= 0
+		}
+
+		return Math.abs(hash)
+	}
+
+	function generateColor(firstname: string, lastname: string) {
+		const hue = hashCode(firstname + lastname) % 360
+		const saturation = 40
+		const lightness = 55
+
+		return `hsl(${hue},${saturation}%,${lightness}%)`
+	}
+
+	const backgroundColor = generateColor(firstname, lastname)
+	const initials = `${firstname.charAt(0).toUpperCase()}${lastname.charAt(0).toUpperCase()}`
+</script>
+
+<div
+	class="text- flex h-10 w-10 items-center justify-center rounded-full text-xl"
+	style="background-color: {backgroundColor};"
+>
+	{initials}
+</div>