Add blockquote support to VS Code to Beehiiv converter (#114)

### Motivation

- Convert Markdown blockquotes into Beehiiv-compatible blockquote figures so the VS Code → Beehiiv workflow preserves quoted content correctly.

### Description

- Add a `BLOCKQUOTE_STYLE` constant and a `BLOCKQUOTE` handling branch inside `convertMarkdownToBeehiiv` in `vscode-to-beehiiv.html`.
- Emit a `<figure data-variant="2" data-type="blockquoteFigure">` wrapper containing a `<blockquote>` with one or more `<p data-id=...>` paragraphs.
- Preserve inline HTML and formatting in quote paragraphs and run the same link (`target`, `rel`, `class`) and code language normalization as other blocks.
- Handle blockquotes that contain no `<p>` by creating a paragraph from the blockquote text.

------
[Codex Task](https://chatgpt.com/codex/tasks/task_e_699372e3cd3483258520f497129f89aa)

Author: rodrigogiraoserrao

vscode-to-beehiiv.html

@@ -120,6 +120,7 @@ <h2>Beehiiv output</h2>
 
             const BLOCK_STYLE = 'font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);';
             const HEADING_STYLE = BLOCK_STYLE.replace('font-weight: 400; ', '');
+            const BLOCKQUOTE_STYLE = 'font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);';
 
             const updateStatus = (message) => {
                 status.textContent = message;
@@ -211,6 +212,45 @@ <h2>Beehiiv output</h2>
                         return;
                     }
 
+                    if (node.tagName === 'BLOCKQUOTE') {
+                        const figure = document.createElement('figure');
+                        figure.setAttribute('data-id', crypto.randomUUID());
+                        figure.setAttribute('data-variant', '2');
+                        figure.setAttribute('data-type', 'blockquoteFigure');
+                        figure.setAttribute('style', BLOCKQUOTE_STYLE);
+
+                        const quote = document.createElement('blockquote');
+
+                        const quoteParagraphs = Array.from(node.querySelectorAll('p'));
+                        if (quoteParagraphs.length === 0) {
+                            const paragraph = document.createElement('p');
+                            paragraph.textContent = node.textContent.trim();
+                            quoteParagraphs.push(paragraph);
+                        }
+
+                        quoteParagraphs.forEach((sourceParagraph) => {
+                            const paragraph = document.createElement('p');
+                            paragraph.setAttribute('data-id', crypto.randomUUID());
+                            paragraph.innerHTML = sourceParagraph.innerHTML;
+
+                            paragraph.querySelectorAll('a').forEach(anchor => {
+                                anchor.setAttribute('target', '_blank');
+                                anchor.setAttribute('rel', 'noopener noreferrer nofollow');
+                                anchor.setAttribute('class', 'link');
+                            });
+
+                            paragraph.querySelectorAll('code').forEach(code => {
+                                normalizeCodeLanguage(code);
+                            });
+
+                            quote.appendChild(paragraph);
+                        });
+
+                        figure.appendChild(quote);
+                        blocks.push(figure.outerHTML);
+                        return;
+                    }
+
                     if (node.tagName.startsWith('H')) {
                         const level = Number.parseInt(node.tagName.replace('H', ''), 10);
                         const heading = document.createElement(node.tagName.toLowerCase());