Support content references for inline visualizations (#37341)

## What changed

- Recognize structured `visualize` content references alongside the existing inline visualization directive in cached, streaming, and finalized TUI rendering.
- Resolve absolute visualization paths only when they belong to the active thread directory, and show the existing unavailable fallback for incomplete, invalid, or out-of-scope references.
- Let embedded visualizations inherit host color, typography, and radius tokens while retaining standalone defaults and legacy aliases. Keep Lucide icons at a stable size when model-authored chart styles are present.

## Testing

- Cover content-reference fallback, replay, render-cache bypass, and canonical streaming behavior.

GitOrigin-RevId: 887d13647df11c23d519e64d0958fdc41ef3f472

codex-rs/tui/src/streaming/render.rs

@@ -5,8 +5,8 @@
 
 use crate::history_cell::HistoryRenderMode;
 use crate::history_cell::raw_lines_from_source;
-use crate::inline_visualization::DIRECTIVE_PREFIX;
 use crate::inline_visualization::InlineVisualizationContext;
+use crate::inline_visualization::contains_inline_visualization;
 use crate::markdown::render_markdown_agent_with_links_cwd_and_visualizations;
 use crate::markdown::render_streaming_markdown_agent_with_links_and_cwd;
 use crate::terminal_hyperlinks::HyperlinkLine;
@@ -61,7 +61,7 @@ impl StreamingRender {
         render_mode: HistoryRenderMode,
         inline_visualization_context: Option<&InlineVisualizationContext>,
     ) {
-        self.has_inline_visualization_directive = source.contains(DIRECTIVE_PREFIX);
+        self.has_inline_visualization_directive = contains_inline_visualization(source);
         self.lines = match (render_mode, inline_visualization_context) {
             (HistoryRenderMode::Rich, None) if !self.has_inline_visualization_directive => {
                 let rendered =
@@ -107,7 +107,7 @@ impl StreamingRender {
             return;
         }
 
-        self.has_inline_visualization_directive |= committed_source.contains(DIRECTIVE_PREFIX);
+        self.has_inline_visualization_directive |= contains_inline_visualization(committed_source);
         if self.has_inline_visualization_directive {
             self.recompute(
                 raw_source,

codex-rs/tui/src/streaming/render_tests.rs

@@ -250,6 +250,20 @@ fn inline_visualizations_without_context_use_canonical_full_render() {
     );
 }
 
+#[test]
+fn inline_visualization_content_references_use_canonical_full_render() {
+    let (_, render) = assert_rich_stream_matches_full_render(
+        &[
+            "Before.\n\n",
+            "\u{e200}visualize\u{e202}{\"path\":\"/tmp/missing.html\"}\u{e201}\n",
+        ],
+        Some(80),
+    );
+
+    assert_eq!(render.stable_source_len, 0);
+    assert!(render.has_inline_visualization_directive);
+}
+
 #[test]
 fn inline_visualization_directive_survives_raw_to_rich_render_mode_switch() {
     let cwd = test_cwd();