[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/tabs/tab_deck_storage.cpp

@@ -2,7 +2,7 @@
 
 #include "../../../client/settings/cache_settings.h"
 #include "../../deck_loader/deck_loader.h"
-#include "../../pixel_map_generator.h"
+#include "../../theme_icon.h"
 #include "../cards/additional_info/deck_color_identity.h"
 #include "../deck_share/deck_share_utils.h"
 #include "../deck_share/share_bar_widget.h"
@@ -187,19 +187,19 @@ TabDeckStorage::TabDeckStorage(TabSupervisor *_tabSupervisor,
 
     // Left side actions
     aOpenLocalDeck = new QAction(this);
-    aOpenLocalDeck->setIcon(themePixmap(QStringLiteral("icons/pencil")));
+    aOpenLocalDeck->setIcon(loadThemedIcon(QStringLiteral("icons/pencil")));
     connect(aOpenLocalDeck, &QAction::triggered, this, &TabDeckStorage::actOpenLocalDeck);
     aRenameLocal = new QAction(this);
-    aRenameLocal->setIcon(themePixmap(QStringLiteral("icons/rename")));
+    aRenameLocal->setIcon(loadThemedIcon(QStringLiteral("icons/rename")));
     connect(aRenameLocal, &QAction::triggered, this, &TabDeckStorage::actRenameLocal);
     aUpload = new QAction(this);
-    aUpload->setIcon(themePixmap(QStringLiteral("icons/arrow_right_green")));
+    aUpload->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_right")));
     connect(aUpload, &QAction::triggered, this, &TabDeckStorage::actUpload);
     aNewLocalFolder = new QAction(this);
     aNewLocalFolder->setIcon(qApp->style()->standardIcon(QStyle::SP_FileDialogNewFolder));
     connect(aNewLocalFolder, &QAction::triggered, this, &TabDeckStorage::actNewLocalFolder);
     aDeleteLocalDeck = new QAction(this);
-    aDeleteLocalDeck->setIcon(themePixmap(QStringLiteral("icons/remove_row")));
+    aDeleteLocalDeck->setIcon(loadThemedIcon(QStringLiteral("icons/remove_row")));
     connect(aDeleteLocalDeck, &QAction::triggered, this, &TabDeckStorage::actDeleteLocalDeck);
 
     aOpenDecksFolder = new QAction(this);
@@ -208,24 +208,24 @@ TabDeckStorage::TabDeckStorage(TabSupervisor *_tabSupervisor,
 
     // Right side actions
     aOpenRemoteDeck = new QAction(this);
-    aOpenRemoteDeck->setIcon(themePixmap(QStringLiteral("icons/pencil")));
+    aOpenRemoteDeck->setIcon(loadThemedIcon(QStringLiteral("icons/pencil")));
     connect(aOpenRemoteDeck, &QAction::triggered, this, &TabDeckStorage::actOpenRemoteDeck);
     aDownload = new QAction(this);
-    aDownload->setIcon(themePixmap(QStringLiteral("icons/arrow_left_green")));
+    aDownload->setIcon(loadThemedIcon(QStringLiteral("icons/arrow_left")));
     connect(aDownload, &QAction::triggered, this, &TabDeckStorage::actDownload);
     aNewFolder = new QAction(this);
     aNewFolder->setIcon(qApp->style()->standardIcon(QStyle::SP_FileDialogNewFolder));
     connect(aNewFolder, &QAction::triggered, this, &TabDeckStorage::actNewFolder);
     aDeleteRemoteDeck = new QAction(this);
-    aDeleteRemoteDeck->setIcon(themePixmap(QStringLiteral("icons/remove_row")));
+    aDeleteRemoteDeck->setIcon(loadThemedIcon(QStringLiteral("icons/remove_row")));
     connect(aDeleteRemoteDeck, &QAction::triggered, this, &TabDeckStorage::actDeleteRemoteDeck);
 
     aShareDecks = new QAction(this);
-    aShareDecks->setIcon(themePixmap(QStringLiteral("icons/share")));
+    aShareDecks->setIcon(loadThemedIcon(QStringLiteral("icons/share")));
     connect(aShareDecks, &QAction::triggered, this, &TabDeckStorage::actShareDecks);
 
     aPublishDeck = new QAction(this);
-    aPublishDeck->setIcon(QPixmap("theme:icons/lock"));
+    aPublishDeck->setIcon(loadThemedIcon(QStringLiteral("icons/lock")));
     connect(aPublishDeck, &QAction::triggered, this, &TabDeckStorage::actPublishDeck);
 
     // Add actions to toolbars