chore: bump version to v0.3.30

Code blocks (triple backticks) had broken styling because prose-code
styles (light background, padding) were also applied to <code> inside
<pre>, conflicting with the dark pre background.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/version.yaml

@@ -1,2 +1,2 @@
 parameters:
-    app.version: '0.3.29'
+    app.version: '0.3.30'

frontend/components/ui/MarkdownPreviewModal.vue

@@ -30,7 +30,7 @@
                     <div class="overflow-y-auto px-6 py-4">
                         <div
                             v-if="content"
-                            class="prose prose-slate max-w-none prose-headings:font-semibold prose-a:text-blue-600 prose-code:rounded prose-code:bg-slate-100 prose-code:px-1.5 prose-code:py-0.5 prose-code:text-sm prose-code:before:content-none prose-code:after:content-none prose-pre:bg-slate-900 prose-pre:text-slate-100"
+                            class="prose prose-slate max-w-none prose-headings:font-semibold prose-a:text-blue-600 prose-code:rounded prose-code:bg-slate-100 prose-code:px-1.5 prose-code:py-0.5 prose-code:text-sm prose-code:before:content-none prose-code:after:content-none prose-pre:bg-slate-900 prose-pre:text-slate-100 prose-pre:overflow-x-auto [&_pre_code]:bg-transparent [&_pre_code]:p-0 [&_pre_code]:text-inherit [&_pre_code]:text-[0.875rem] [&_pre_code]:leading-relaxed"
                             v-html="renderedHtml"
                         />
                         <p v-else class="text-sm italic text-slate-400">