fix: open markdown links in user's default browser

Closes #54

src/lib/components/Markdown.svelte

@@ -2,6 +2,7 @@
   import { marked } from "marked";
   import hljs from "highlight.js";
   import { onMount } from "svelte";
+  import { openUrl } from "@tauri-apps/plugin-opener";
 
   interface Props {
     content: string;
@@ -75,6 +76,15 @@
     }
   }
 
+  function handleLinkClick(event: MouseEvent) {
+    const target = event.target as HTMLElement;
+    const anchor = target.closest("a");
+    if (anchor?.href) {
+      event.preventDefault();
+      openUrl(anchor.href);
+    }
+  }
+
   onMount(() => {
     if (containerElement) {
       containerElement.querySelectorAll("pre code:not(.hljs)").forEach((block) => {
@@ -87,7 +97,10 @@
 <div
   bind:this={containerElement}
   class="markdown-content"
-  onclick={handleSpoilerClick}
+  onclick={(e) => {
+    handleSpoilerClick(e);
+    handleLinkClick(e);
+  }}
   onkeydown={handleSpoilerKeydown}
   role="presentation"
 >