Enhance terminal display with new markdown emphasis styles

Add support for various markdown emphasis styles in the terminal display, including strong, emphasis, code, code block, and headers. Update the Console configuration to ensure ANSI styles are preserved during rendering.

agent/utils/terminal_display.py

@@ -14,6 +14,15 @@ _THEME = Theme({
     "tool.fail": "dim red",
     "info": "dim",
     "muted": "dim",
+    # Markdown emphasis colors
+    "markdown.strong": "bold rgb(255,200,80)",
+    "markdown.emphasis": "italic rgb(180,140,40)",
+    "markdown.code": "rgb(120,220,255)",
+    "markdown.code_block": "rgb(120,220,255)",
+    "markdown.link": "underline rgb(90,180,255)",
+    "markdown.h1": "bold rgb(255,200,80)",
+    "markdown.h2": "bold rgb(240,180,95)",
+    "markdown.h3": "bold rgb(220,165,100)",
 })
 
 _console = Console(theme=_THEME, highlight=False)
@@ -234,7 +243,16 @@ def print_markdown(text: str) -> None:
 
     # Render markdown to a string buffer so we can type it out
     buf = io.StringIO()
-    buf_console = Console(file=buf, width=_console.width, highlight=False, theme=_THEME)
+    # Important: StringIO is not a TTY, so Rich would normally strip styles.
+    # Force terminal rendering so ANSI style codes are preserved for typewriter output.
+    buf_console = Console(
+        file=buf,
+        width=_console.width,
+        highlight=False,
+        theme=_THEME,
+        force_terminal=True,
+        color_system=_console.color_system or "truecolor",
+    )
     buf_console.print(Padding(Markdown(text), (0, 0, 0, 2)))
     rendered = buf.getvalue()