wrap markdown at render time (#4506)

This results in correctly indenting list items with long lines.

<img width="1006" height="251" alt="Screenshot 2025-09-30 at 10 00
48 AM"
src="https://github.com/user-attachments/assets/0a076cf6-ca3c-4efb-b3af-dc07617cdb6f"
/>

codex-rs/tui/src/markdown.rs

@@ -2,17 +2,47 @@ use codex_core::config::Config;
 use codex_core::config_types::UriBasedFileOpener;
 use ratatui::text::Line;
 use std::path::Path;
+use std::path::PathBuf;
 
-pub(crate) fn append_markdown(
-    markdown_source: &str,
-    lines: &mut Vec<Line<'static>>,
-    config: &Config,
-) {
-    append_markdown_with_opener_and_cwd(markdown_source, lines, config.file_opener, &config.cwd);
+#[derive(Clone, Debug)]
+pub struct MarkdownCitationContext {
+    file_opener: UriBasedFileOpener,
+    cwd: PathBuf,
 }
 
-fn append_markdown_with_opener_and_cwd(
+impl MarkdownCitationContext {
+    pub(crate) fn new(file_opener: UriBasedFileOpener, cwd: PathBuf) -> Self {
+        Self { file_opener, cwd }
+    }
+}
+
+impl From<&Config> for MarkdownCitationContext {
+    fn from(config: &Config) -> Self {
+        MarkdownCitationContext::new(config.file_opener, config.cwd.clone())
+    }
+}
+
+pub(crate) fn append_markdown<C>(
     markdown_source: &str,
+    width: Option<usize>,
+    lines: &mut Vec<Line<'static>>,
+    citation_context: C,
+) where
+    C: Into<MarkdownCitationContext>,
+{
+    let citation_context: MarkdownCitationContext = citation_context.into();
+    append_markdown_with_opener_and_cwd(
+        markdown_source,
+        width,
+        lines,
+        citation_context.file_opener,
+        &citation_context.cwd,
+    );
+}
+
+pub(crate) fn append_markdown_with_opener_and_cwd(
+    markdown_source: &str,
+    width: Option<usize>,
     lines: &mut Vec<Line<'static>>,
     file_opener: UriBasedFileOpener,
     cwd: &Path,
@@ -20,6 +50,7 @@ fn append_markdown_with_opener_and_cwd(
     // Render via pulldown-cmark and rewrite citations during traversal (outside code blocks).
     let rendered = crate::markdown_render::render_markdown_text_with_citations(
         markdown_source,
+        width,
         file_opener.get_scheme(),
         cwd,
     );
@@ -36,7 +67,7 @@ mod tests {
         let src = "Before 【F:/x.rs†L1】\n```\nInside 【F:/x.rs†L2】\n```\nAfter 【F:/x.rs†L3】\n";
         let cwd = Path::new("/");
         let mut out = Vec::new();
-        append_markdown_with_opener_and_cwd(src, &mut out, UriBasedFileOpener::VsCode, cwd);
+        append_markdown_with_opener_and_cwd(src, None, &mut out, UriBasedFileOpener::VsCode, cwd);
         let rendered: Vec<String> = out
             .iter()
             .map(|l| {
@@ -69,7 +100,7 @@ mod tests {
         let src = "Before\n\n    code 1\n\nAfter\n";
         let cwd = Path::new("/");
         let mut out = Vec::new();
-        append_markdown_with_opener_and_cwd(src, &mut out, UriBasedFileOpener::None, cwd);
+        append_markdown_with_opener_and_cwd(src, None, &mut out, UriBasedFileOpener::None, cwd);
         let lines: Vec<String> = out
             .iter()
             .map(|l| {
@@ -87,7 +118,7 @@ mod tests {
         let src = "Start 【F:/x.rs†L1】\n\n    Inside 【F:/x.rs†L2】\n\nEnd 【F:/x.rs†L3】\n";
         let cwd = Path::new("/");
         let mut out = Vec::new();
-        append_markdown_with_opener_and_cwd(src, &mut out, UriBasedFileOpener::VsCode, cwd);
+        append_markdown_with_opener_and_cwd(src, None, &mut out, UriBasedFileOpener::VsCode, cwd);
         let rendered: Vec<String> = out
             .iter()
             .map(|l| {
@@ -117,7 +148,7 @@ mod tests {
         let src = "Hi! How can I help with codex-rs today? Want me to explore the repo, run tests, or work on a specific change?\n";
         let cwd = Path::new("/");
         let mut out = Vec::new();
-        append_markdown_with_opener_and_cwd(src, &mut out, UriBasedFileOpener::None, cwd);
+        append_markdown_with_opener_and_cwd(src, None, &mut out, UriBasedFileOpener::None, cwd);
         assert_eq!(
             out.len(),
             1,
@@ -143,6 +174,7 @@ mod tests {
         let mut out = Vec::new();
         append_markdown_with_opener_and_cwd(
             "1. Tight item\n",
+            None,
             &mut out,
             UriBasedFileOpener::None,
             cwd,
@@ -166,7 +198,7 @@ mod tests {
         let src = "Loose vs. tight list items:\n1. Tight item\n";
         let cwd = Path::new("/");
         let mut out = Vec::new();
-        append_markdown_with_opener_and_cwd(src, &mut out, UriBasedFileOpener::None, cwd);
+        append_markdown_with_opener_and_cwd(src, None, &mut out, UriBasedFileOpener::None, cwd);
 
         let lines: Vec<String> = out
             .iter()