Fix SVG icons and checkboxes: bundle qt6-svg-plugins

The AppImage was missing libqsvg.so (Qt SVG imageformat plugin),
causing SVG-based theme icons and checkboxes to render as blank
squares. Add qt6-svg-dev and qt6-svg-plugins to the Docker image.
Also add explicit unchecked checkbox images to all vs15 Dark themes
for consistent rendering on Linux.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

10 files changed, 126 insertions, 0 deletions

diff --git a/src/src/stylesheets/vs15 Dark-Green.qss b/src/src/stylesheets/vs15 Dark-Green.qss
index ae0390e..df22889 100644
--- a/src/src/stylesheets/vs15 Dark-Green.qss
+++ b/src/src/stylesheets/vs15 Dark-Green.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #009933;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark-Orange.qss b/src/src/stylesheets/vs15 Dark-Orange.qss
index 5e8a3a4..0b911fd 100644
--- a/src/src/stylesheets/vs15 Dark-Orange.qss
+++ b/src/src/stylesheets/vs15 Dark-Orange.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #cc6600;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark-Pink.qss b/src/src/stylesheets/vs15 Dark-Pink.qss
index 5bc3bbd..9ae437a 100644
--- a/src/src/stylesheets/vs15 Dark-Pink.qss
+++ b/src/src/stylesheets/vs15 Dark-Pink.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #bb4287;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark-Purple.qss b/src/src/stylesheets/vs15 Dark-Purple.qss
index afcf897..e9606f4 100644
--- a/src/src/stylesheets/vs15 Dark-Purple.qss
+++ b/src/src/stylesheets/vs15 Dark-Purple.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #7e2ad2;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark-Red.qss b/src/src/stylesheets/vs15 Dark-Red.qss
index d6f89f6..612ccdd 100644
--- a/src/src/stylesheets/vs15 Dark-Red.qss
+++ b/src/src/stylesheets/vs15 Dark-Red.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #990000;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark-Yellow.qss b/src/src/stylesheets/vs15 Dark-Yellow.qss
index b3d62d5..70340cb 100644
--- a/src/src/stylesheets/vs15 Dark-Yellow.qss
+++ b/src/src/stylesheets/vs15 Dark-Yellow.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #9a9a00;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15 Dark.qss b/src/src/stylesheets/vs15 Dark.qss
index 8bb2c77..61ecdd7 100644
--- a/src/src/stylesheets/vs15 Dark.qss
+++ b/src/src/stylesheets/vs15 Dark.qss
@@ -396,6 +396,24 @@ QRadioButton::indicator:hover {
   border-color: #007acc;
 }
 
+QGroupBox::indicator:unchecked,
+QTreeView::indicator:unchecked,
+QCheckBox::indicator:unchecked {
+  image: url(./vs15/checkbox.png);
+}
+
+QGroupBox::indicator:unchecked:hover,
+QTreeView::indicator:unchecked:hover,
+QCheckBox::indicator:unchecked:hover {
+  image: url(./vs15/checkbox-hover.png);
+}
+
+QGroupBox::indicator:unchecked:disabled,
+QTreeView::indicator:unchecked:disabled,
+QCheckBox::indicator:unchecked:disabled {
+  image: url(./vs15/checkbox-disabled.png);
+}
+
 QGroupBox::indicator:checked,
 QTreeView::indicator:checked,
 QCheckBox::indicator:checked {
diff --git a/src/src/stylesheets/vs15/checkbox-disabled.png b/src/src/stylesheets/vs15/checkbox-disabled.png
new file mode 100644
index 0000000..f2ac87a
--- /dev/null
+++ b/src/src/stylesheets/vs15/checkbox-disabled.png
diff --git a/src/src/stylesheets/vs15/checkbox-hover.png b/src/src/stylesheets/vs15/checkbox-hover.png
new file mode 100644
index 0000000..14d1008
--- /dev/null
+++ b/src/src/stylesheets/vs15/checkbox-hover.png
diff --git a/src/src/stylesheets/vs15/checkbox.png b/src/src/stylesheets/vs15/checkbox.png
new file mode 100644
index 0000000..a3a4e1c
--- /dev/null
+++ b/src/src/stylesheets/vs15/checkbox.png