feat: pass source path to markdown parser for icon resolution

Pass the file's base path through the markdown parsing pipeline to
allow the icon directive to resolve relative asset paths correctly
using an absolute fallback chain.

src/components/Article.tsx

@@ -135,7 +135,7 @@ export const Article: Component<ArticleProps & ParentProps> = (props) => {
           <div
             class="relative"
             ref={setContentDom}
-            innerHTML={parseMarkdown(content()!)}
+            innerHTML={parseMarkdown(content()!, props.src)}
           />
           {props.children}
         </ArticleDomCtx.Provider>

src/components/md-deck/CardLayer.tsx

@@ -27,6 +27,7 @@ export function CardLayer(props: CardLayerProps) {
   function renderLayerContent(content: string) {
     return parseMarkdown(
       processVariables(content, props.cardData, props.store.state.cards),
+      props.store.state.cards.sourcePath,
     ) as string;
   }
 

src/components/md-embed.tsx

@@ -53,7 +53,10 @@ customElement("md-embed", { headingBase: 0 }, (props, { element }) => {
       </Show>
       <Show when={!content.loading && !content.error && content()}>
         {/* biome-ignore lint/security/noDangerouslySetInnerHtml: markdown render */}
-        <div class="prose" innerHTML={parseMarkdown(content()!)} />
+        <div
+          class="prose"
+          innerHTML={parseMarkdown(content()!, resolvedPath)}
+        />
       </Show>
     </div>
   );