Replace RSS articles icons with SVG

Closes #22335.
PR #23082.

src/gui/rss/articlelistwidget.cpp

@@ -35,11 +35,13 @@
 #include "base/rss/rss_article.h"
 #include "base/rss/rss_item.h"
 #include "gui/uithememanager.h"
+#include "gui/utils.h"
 
 ArticleListWidget::ArticleListWidget(QWidget *parent)
     : QListWidget(parent)
 {
     setContextMenuPolicy(Qt::CustomContextMenu);
+    setIconSize(Utils::Gui::smallIconSize());
     setSelectionMode(QAbstractItemView::ExtendedSelection);
 
     checkInvariant();

src/icons/icons.qrc

@@ -334,8 +334,8 @@
         <file>queued.svg</file>
         <file>ratio.svg</file>
         <file>reannounce.svg</file>
-        <file>rss_read_article.png</file>
-        <file>rss_unread_article.png</file>
+        <file>rss_read_article.svg</file>
+        <file>rss_unread_article.svg</file>
         <file>security-high.svg</file>
         <file>security-low.svg</file>
         <file>set-location.svg</file>

src/icons/rss_read_article.svg

@@ -0,0 +1 @@
+<svg width="32" height="32" xmlns="http://www.w3.org/2000/svg"><circle cx="16" cy="16" r="8" fill="#9aa0a6" /></svg>

src/icons/rss_unread_article.svg

@@ -0,0 +1 @@
+<svg width="32" height="32" xmlns="http://www.w3.org/2000/svg"><circle cx="16" cy="16" r="8" fill="#1e90ff" /></svg>