From 3b27bccddaa5bb4bd6eed65a155824e81a03421c Mon Sep 17 00:00:00 2001
From: Levi Neely <lneely@pascom.net>
Date: Wed, 29 Jul 2026 16:25:36 +0200
Subject: [PATCH] diagrams: force light theme for mermaid rendering

Text and connectors were invisible because mmdc rendered with a dark
theme (white text/edges) on the white diagram background. Explicitly
pass -t default to force dark text on light background.
---
 gui/chatblockmodel.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gui/chatblockmodel.cpp b/gui/chatblockmodel.cpp
index 6a875ef..af15526 100644
--- a/gui/chatblockmodel.cpp
+++ b/gui/chatblockmodel.cpp
@@ -966,7 +966,8 @@ QString ChatBlockModel::diagramUrl(const QString &source, const QString &languag
         proc.start(mmdc, {
             QStringLiteral("-i"), input.fileName(),
             QStringLiteral("-o"), svgPath,
-            QStringLiteral("-b"), QStringLiteral("transparent")
+            QStringLiteral("-t"), QStringLiteral("default"),
+            QStringLiteral("-b"), QStringLiteral("white")
         });
 
         if (!proc.waitForFinished(15000))