aider: fix: Align headings left while preserving h1/h2 styling

aider/mdstream.py

@@ -3,9 +3,11 @@
 import io
 import time
 
+from rich import box
 from rich.console import Console
 from rich.live import Live
 from rich.markdown import CodeBlock, Heading, Markdown
+from rich.panel import Panel
 from rich.syntax import Syntax
 from rich.text import Text
 
@@ -62,7 +64,18 @@ class LeftHeading(Heading):
     def __rich_console__(self, console, options):
         text = self.text
         text.justify = "left"  # Override justification
-        yield text
+        if self.tag == "h1":
+            # Draw a border around h1s, but keep text left-aligned
+            yield Panel(
+                text,
+                box=box.HEAVY,
+                style="markdown.h1.border",
+            )
+        else:
+            # Styled text for h2 and beyond
+            if self.tag == "h2":
+                yield Text("")  # Keep the blank line before h2
+            yield text
 
 
 class NoInsetMarkdown(Markdown):