Svelte 5 vs Svelte 4 Rules

I'm using svelte 5 instead of svelte 4 here is an overview of the changes.
# .cursorrunes for Svelte 5

## Overview of Changes

Svelte 5 introduces runes, a set of advanced primitives for controlling reactivity. The runes replace certain non-runes features and provide more explicit control over state and effects.

Snippets, along with render tags, help create reusable chunks of markup inside your components, reducing duplication and enhancing maintainability.

## Event Handlers in Svelte 5

In Svelte 5, event handlers are treated as standard HTML properties rather than Svelte-specific directives, simplifying their use and integrating them more closely with the rest of the properties in the component.

### Svelte 4 vs. Svelte 5:

**Before (Svelte 4):**
```html
<script>
  let count = 0;
  $: double = count * 2;
  $: {
    if (count > 10) alert('Too high!');
  }
</script>
<button on:click={() => count++}> {count} / {double}</button>
```

**After (Svelte 5):**
```html
<script>
  import { $state, $effect, $derived } from 'svelte';
  
  // Define state with runes
  let count = $state(0);
  
  // Option 1: Using $derived for computed values
  let double = $derived(count * 2);
  
  // Reactive effects using runes
  $effect(() => {