Render assistant file citations as local links (#42650)

## What changed

- Convert `codex-file-citation` directives in assistant Markdown into local-file links while preserving paths with Markdown-significant characters, Unicode, Windows separators, and location suffixes.
- Apply citation rendering consistently to streaming output, finalized messages and plans, and resume-picker transcript previews.
- Keep directives literal in code, HTML, existing links, reference definitions, escaped text, and generic Markdown rendering.
- Bound repeated parsing work for malformed directive candidates without limiting valid citations.

## Testing

- Add coverage for citation parsing and rendering across finalized, streaming, and resume-preview output, including malformed input and path edge cases.

GitOrigin-RevId: 5a0bfb3fc7ac21b7e8846fd170a349fb2d2d5e85

codex-rs/tui/src/markdown.rs

@@ -98,13 +98,13 @@ pub(crate) fn render_markdown_agent_with_links_cwd_and_visualizations(
         rewritten.trusted_file_links.contains_key(destination)
             || crate::markdown_render::hide_web_link_destination(destination)
     };
-    let mut lines =
-        crate::markdown_render::render_markdown_lines_with_width_cwd_and_hidden_link_destinations(
-            &normalized,
-            width,
-            cwd,
-            &is_hidden_link_destination,
-        );
+    let mut lines = crate::markdown_render::render_streaming_markdown_lines_with_width_and_cwd(
+        &normalized,
+        width,
+        cwd,
+        &is_hidden_link_destination,
+    )
+    .lines;
     for hyperlink in lines.iter_mut().flat_map(|line| &mut line.hyperlinks) {
         if let Some(link) = rewritten.trusted_file_links.get(&hyperlink.destination) {
             hyperlink.retarget_to_trusted_file(&link.destination);