Improve chat readability and source display

app.py

@@ -157,7 +157,7 @@ def format_sources(results: list[tuple[SourceChunk, float]]) -> tuple[str, str]:
     for position, (chunk, score) in enumerate(results, start=1):
         context_parts.append(f"[S{position}] {chunk.text}")
         title = f"[{chunk.title}]({chunk.url})" if chunk.url else chunk.title
-        source_lines.append(f"**S{position}.** {title} - `{chunk.source_id}`")
+        source_lines.append(f"**S{position}.** {title}")
     return "\n\n".join(context_parts), "\n\n".join(source_lines)
 
 
@@ -258,9 +258,13 @@ CSS = """
 h1, h2, h3, p { color: var(--ink) !important; }
 .panel .block, .panel .wrap, .panel .form { background: #fff !important; color: var(--ink) !important; }
 .panel input, .panel textarea { background: #fff !important; color: var(--ink) !important; }
-#aphaea-chat { background: #fff !important; color: var(--ink) !important; }
-#aphaea-chat .wrap { background: #1f2937 !important; }
-#aphaea-chat .wrap, #aphaea-chat .wrap * { color: #f8fafc !important; }
+#aphaea-chat,
+#aphaea-chat .wrap,
+#aphaea-chat .message,
+#aphaea-chat .message * {
+  background: #ffffff !important;
+  color: var(--ink) !important;
+}
 .panel label, .panel label span, .panel .label-wrap { color: var(--ink) !important; }
 button.primary { color: #fff !important; }
 .profile-copy { color: var(--muted); font-size: 13px; }