Replace html2text with fast_html2md + tui-markdown for styled email preview

HTML emails are now converted to markdown then rendered with rich formatting
(bold, italic, headings, links) in the preview pane via tui-markdown.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -12,6 +12,7 @@ serde = { version = "1.0", features = ["derive"] }
 toml = "1.0"
 chrono = "0.4"
 mailparse = "0.15"
-html2text = "0.14"
+fast_html2md = "0.0"
+tui-markdown = "0.3"
 quoted_printable = "0.5"
 regex = "1"

src/inbox.rs

@@ -205,9 +205,10 @@ fn extract_plain_text(raw: &[u8]) -> Result<String, String> {
     if let Some(text) = find_part(&parsed, "text/plain") {
         return Ok(clean_text(&text));
     }
-    // Fall back to text/html rendered as text
+    // Fall back to text/html converted to markdown
     if let Some(html) = find_part(&parsed, "text/html") {
-        return Ok(clean_text(&html_to_text(&html)));
+        let md = html2md::rewrite_html(&html, false);
+        return Ok(clean_text(&md));
     }
     // Last resort: top-level body
     parsed.get_body().map(|s| clean_text(&s)).map_err(|e| e.to_string())
@@ -237,6 +238,3 @@ fn find_part(mail: &mailparse::ParsedMail, mime_type: &str) -> Option<String> {
     None
 }
 
-fn html_to_text(html: &str) -> String {
-    html2text::from_read(html.as_bytes(), 1000).unwrap_or_else(|_| html.to_string())
-}

src/lib.rs

@@ -257,9 +257,9 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
 
             // --- Bottom: Email preview ---
             let preview_text = if body_loading {
-                "Loading...".to_string()
+                ratatui::text::Text::raw("Loading...")
             } else {
-                preview_body.clone()
+                tui_markdown::from_str(&preview_body)
             };
             let preview = Paragraph::new(preview_text)
                 .block(Block::default().title("Preview").borders(Borders::ALL).border_style(preview_border))