feat: implement English Style Converter

- SvelteKit project scaffolded with TypeScript
- Type definitions for Style, StyleCategory, ConversionRequest, ConversionResponse, LLMConfig
- Style definitions with 6 categories and 25 sub-styles
- Intensity mapping (1-5) with prompt modifier placeholders
- LLM client using OpenAI-compatible API (Ollama default)
- POST /api/convert endpoint with input validation
- Animated loading modal with per-letter animations
- Main page UI with category/style selectors, intensity slider
- Copy to clipboard, collapsible prompt display
- Vitest tests for styles, LLM prompt building, and API validation
- Environment configuration for LLM settings

src/routes/+layout.svelte

@@ -1,11 +1,11 @@
 <script lang="ts">
-	import favicon from '$lib/assets/favicon.svg';
+	import '../app.css';
 
 	let { children } = $props();
 </script>
 
 <svelte:head>
-	<link rel="icon" href={favicon} />
+	<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>✨</text></svg>" />
 </svelte:head>
 
-{@render children()}
+{@render children()}