draw the scrap of a debris card as an icon, not a word

The debris card's row now reads "Remaining" with the amount and the bare
scrap icon after it, and the count summary's indented sub-row states its
total the same way; both fall back to naming the item in words when no
scrap icon file exists.

StatRow gained the value-plus-icon form: a label draws either text or a
pixmap, so the two are composed into one via renderCaptionWithIcon, with
the color passed in because a pixmap does not follow the palette. That
also closes a gap in the building multi-selection, whose "Total cost" was
specified to carry the building_block icon and showed the bare number.

ItemIconCache::getInlineIcon() packages the sizing rule of the bare inline
icon. It sits on the cache rather than in IconCaption so StatRow keeps
pulling in nothing but the caption helper: StatRow.cpp is compiled into
DotaFactory_balancing, which links neither the ui library nor QtSvg, and
that target now compiles IconCaption.cpp along with it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ne3mejABZoLWKLh8fgpM3x

src/ui/ItemIconCache.cpp

@@ -1,6 +1,7 @@
 #include "ItemIconCache.h"
 
 #include <QFile>
+#include <QFontMetrics>
 #include <QPainter>
 #include <QRectF>
 #include <QSvgRenderer>
@@ -94,6 +95,12 @@ QPixmap ItemIconCache::getPixmap(const std::string& itemId, int sizePx)
     return getPixmap(itemId, itemId, sizePx, false);
 }
 
+QPixmap ItemIconCache::getInlineIcon(const std::string& itemId, const QFont& font)
+{
+    if (!hasIcon(itemId)) { return QPixmap(); }
+    return getPixmap(itemId, QFontMetrics(font).height());
+}
+
 QPixmap ItemIconCache::getPixmap(const std::string& cacheKey, const std::string& itemId,
                                  int sizePx, bool withSquare)
 {