[Icons] Migrate UI glyphs to palette-token SVGs (#7595)

* [Icons] Migrate UI glyphs to palette-token SVGs

Runtime inversion is not a theming system: it rotates hue, breaks duotone art
and mishandles alpha, and a QPixmap snapshot cannot follow a palette change.
Redraw the top-level UI glyph set on a 24x24 grid with `currentColor` as the
paint token, drop Inkscape/Sodipodi cruft, and delete the icons whose metaphor
was duplicated (cogwheel/gear -> settings, scale_balanced -> scales,
update.png -> reload).

Load the glyphs through `loadThemedIcon` so the engine resolves the token from
the palette on every request, and let `themePixmap` use the same resolution for
one-shot pixmaps. `loadColorAdjustedPixmap` is gone; every caller now keeps a
QIcon, which `SettingsButtonWidget::setButtonIcon` accepts instead of a QPixmap.

Content art (mana, counters, countries) keeps its authored colors.

Add a render test covering aspect ratio, palette flips, icon modes and
high-DPI pixmaps.

* [Tests] Keep the icon render test QApplication alive until exit

Creating it as a function-local static tears it down before Qt's library statics
at exit, and libQt6Network then runs QObject destructors against freed memory —
a SEGV the sanitizer leg reports after the tests have already passed. Leak the
application instead, the usual pattern for a test binary.

* [Icons] Render lock and dropdown glyphs through the icon engine

Both generators rendered the sentinel SVG to a fixed height x height pixmap
at DPR 1. The pre-migration path rendered larger and let QIcon scale it, so
on a 2x display the games-list lock (13px) and the banner dropdown arrow
(24px) came back crisp; the new path hands the widget a DPR-1 bitmap that
gets upscaled and blurred.

- The games list asks the themed engine for `icons/lock` directly, so the
  item view paints it at the device pixel ratio and the lock also follows
  HighlightedText on a selected row.
- The dropdown goes through `loadThemedIcon(...).pixmap(size, dpr)`, which
  keeps the glyph's aspect ratio and renders at the requested ratio.
- LockPixmapGenerator has no consumer left, so it and its cache are gone.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/dialogs/dlg_manage_sets.cpp

@@ -1,7 +1,7 @@
 #include "dlg_manage_sets.h"
 
 #include "../../../client/settings/cache_settings.h"
-#include "../../pixel_map_generator.h"
+#include "../../theme_icon.h"
 #include "../interface/card_picture_loader/card_picture_loader.h"
 #include "../interface/widgets/utility/custom_line_edit.h"
 #include "libcockatrice/card/database/card_database.h"
@@ -58,28 +58,28 @@ WndSets::WndSets(QWidget *parent) : QMainWindow(parent)
     setsEditToolBar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
 
     aTop = new QAction(QString(), this);
-    aTop->setIcon(themePixmap(QStringLiteral("icons/arrow_top_green")));
+    aTop->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_to_top")));
     aTop->setToolTip(tr("Move selected set to the top"));
     aTop->setEnabled(false);
     connect(aTop, &QAction::triggered, this, &WndSets::actTop);
     setsEditToolBar->addAction(aTop);
 
     aUp = new QAction(QString(), this);
-    aUp->setIcon(themePixmap(QStringLiteral("icons/arrow_up_green")));
+    aUp->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_up")));
     aUp->setToolTip(tr("Move selected set up"));
     aUp->setEnabled(false);
     connect(aUp, &QAction::triggered, this, &WndSets::actUp);
     setsEditToolBar->addAction(aUp);
 
     aDown = new QAction(QString(), this);
-    aDown->setIcon(themePixmap(QStringLiteral("icons/arrow_down_green")));
+    aDown->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_down")));
     aDown->setToolTip(tr("Move selected set down"));
     aDown->setEnabled(false);
     connect(aDown, &QAction::triggered, this, &WndSets::actDown);
     setsEditToolBar->addAction(aDown);
 
     aBottom = new QAction(QString(), this);
-    aBottom->setIcon(themePixmap(QStringLiteral("icons/arrow_bottom_green")));
+    aBottom->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_to_bottom")));
     aBottom->setToolTip(tr("Move selected set to the bottom"));
     aBottom->setEnabled(false);
     connect(aBottom, &QAction::triggered, this, &WndSets::actBottom);
@@ -89,7 +89,7 @@ WndSets::WndSets(QWidget *parent) : QMainWindow(parent)
     searchField = new LineEditUnfocusable;
     searchField->setObjectName("searchEdit");
     searchField->setPlaceholderText(tr("Search by set name, code, type, or release date"));
-    searchField->addAction(themePixmap(QStringLiteral("icons/search")), LineEditUnfocusable::LeadingPosition);
+    searchField->addAction(loadThemedIcon(QStringLiteral("icons/search")), LineEditUnfocusable::LeadingPosition);
     searchField->setClearButtonEnabled(true);
     setFocusProxy(searchField);