R4.4: export and copy read as the visual mode reads

HTML export, plain text and rich copy read each paragraph, heading,
cell and HTML block through the component's MarkdownReader (pin
1251221). Emoji, alerts, the TOC and inline tags match visual mode.
Footnotes sit in place as [n]; link titles are not written.

Three review rounds failed; round 3's one finding (a scan per
footnote over open marks) is fixed with a growth regression, unreviewed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/ely-mark/src/output/tests.rs

@@ -2,6 +2,8 @@ use std::path::Path;
 
 use super::{Pictures, body, document, plain};
 
+mod visual;
+
 fn page(text: &str, beside: Option<&Path>, pictures: &Pictures) -> super::Page {
     body(text, beside, pictures).expect("a page")
 }
@@ -51,17 +53,17 @@ fn markdown_writes_as_html() {
     let text = "# T\n\n- [x] done\n- b\n\n3. c\n\n| l | r |\n|:--|--:|\n| 1 | 2 |\n\n~~gone~~ [a](https://x.org \"t\") [r][ref] [bad](javascript:alert(1))\n\nNote[^1].\n\n[^1]: The note.\n\n[ref]: /docs\n";
     let html = page(text, None, &Pictures::Inline).html;
     for part in [
-        "<h1>T</h1>",
+        "<h1 id=\"h-0\">T</h1>",
         "<li><input type=\"checkbox\" disabled checked> done</li>",
         "<ol start=\"3\">",
         "<th style=\"text-align:left\">l</th>",
         "<td style=\"text-align:right\">2</td>",
         "<del>gone</del>",
-        "<a href=\"https://x.org\" title=\"t\">a</a>",
+        "<a href=\"https://x.org\">a</a>",
         "<a href=\"/docs\">r</a>",
         "<a>bad</a>",
         "<sup><a href=\"#fn-1\">1</a></sup>",
-        "<li id=\"fn-1\"><p>The note.</p></li>",
+        "<div id=\"fn-1\" style=\"display:flex;gap:.5em;font-size:.9em;color:#59636e\"><span>[1]</span><div><p>The note.</p></div></div>",
     ] {
         assert!(html.contains(part), "{part} in {html}");
     }
@@ -458,9 +460,15 @@ fn a_formula_letter_no_font_has_stays_as_tex() {
 fn a_large_document_exports_whole() {
     // Long paragraphs: markdown-rs slows with the block count.
     let words = "word ".repeat(200);
-    let mut text: String = (0..2_200).map(|n| format!("Paragraph {n}: {words}\n\n")).collect();
+    let mut text: String = (0..2_200)
+        .map(|n| format!("Paragraph {n}: {words}\n\n"))
+        .collect();
     text.push_str("The last line.\n");
     assert!(text.len() > ely_gpui_component::documents::LARGEST_READ);
     assert!(plain(&text).expect("text").ends_with("The last line.\n"));
-    assert!(page(&text, None, &Pictures::Inline).html.ends_with("<p>The last line.</p>"));
+    assert!(
+        page(&text, None, &Pictures::Inline)
+            .html
+            .ends_with("<p>The last line.</p>")
+    );
 }