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/balancing/CMakeLists.txt

@@ -13,6 +13,9 @@ SET(HDRS
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/BarRow.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/SectionBox.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/SelectionNames.h
+	# A stat row states a value with an inline item icon (REQ-UI-ITEM-ICON), which this
+	# composes; it needs nothing but Qt's painting.
+	${CMAKE_CURRENT_SOURCE_DIR}/../ui/IconCaption.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsConfig.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsLoader.h
 	# Shared world-space shapes so the arena keeps looking like the game
@@ -36,6 +39,7 @@ SET(SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/BarRow.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/SectionBox.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/selection/SelectionNames.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/../ui/IconCaption.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsLoader.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/WorldPrimitives.cpp
 	PARENT_SCOPE