fix: resolve runtime errors and missing routes

- Fix $effect orphan error: move $effect calls from store constructors
  to initEffects() methods called from component context
- Fix icon rendering: create DynamicIcon component to render Lucide icons
  from name strings instead of displaying raw text
- Add /boards/new route for board creation
- Fix seed emails (admin@launcher.local / user@launcher.local) to pass
  Zod email validation

src/lib/components/ui/DynamicIcon.svelte

@@ -0,0 +1,27 @@
+<script lang="ts">
+	import * as icons from 'lucide-svelte';
+
+	interface Props {
+		name: string | null;
+		size?: number;
+		class?: string;
+	}
+
+	let { name, size = 16, class: className = '' }: Props = $props();
+
+	// Convert kebab-case to PascalCase: "layout-dashboard" → "LayoutDashboard"
+	function toPascalCase(str: string): string {
+		return str
+			.split('-')
+			.map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+			.join('');
+	}
+
+	const iconComponent = $derived(
+		name ? (icons as Record<string, unknown>)[toPascalCase(name)] ?? null : null
+	);
+</script>
+
+{#if iconComponent}
+	<svelte:component this={iconComponent} {size} class={className} />
+{/if}