Use "Scrap x N" notation for the scrap total

Bring the scrap total in line with the "<type> x <count>" notation used
everywhere else in the selected-objects panel (was "Scrap: N").

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc

docs/requirements.md

@@ -506,7 +506,7 @@ The screen is divided into two columns: a main column (75% width) containing the
 - REQ-UI-FIELD-MULTI-SELECTION: The full single-actor stats panel (REQ-UI-SHIP-STATS-PANEL, REQ-UI-STATION-STATS-PANEL) is shown only when the field selection holds exactly one actor and no scrap. Whenever the selection holds more than one object — multiple actors, or a single actor together with scrap — the panel shows a **compact summary** instead: a count per actor type, one line per type rendered as "<type> x <count>" (the same `x`-count notation as the recipe tooltip and the building multi-selection, REQ-UI-MULTI-SELECTION). Ships are grouped by schematic display name and defence stations as a group, distinguishing player from enemy. No per-actor detail and no total-actor-count header are shown (consistent with the building panel). If scrap piles are also part of the field selection (REQ-UI-SELECTION-CATEGORIES) their total is appended as a final line of the same summary (REQ-UI-SCRAP-PANEL), so all lines share uniform spacing. Building selections use REQ-UI-SINGLE-SELECTION / REQ-UI-MULTI-SELECTION instead.
 - REQ-UI-SCRAP-CLICK-SELECT: The player can click any scrap pile (REQ-RES-SCRAP-DROP) in the game world to select it. Scrap piles are field objects (REQ-UI-SELECTION-CATEGORIES) and can be selected together with ships and defence stations, but not with buildings. A plain click on a scrap pile makes it the sole selection, clearing any previous selection; selecting a building clears any scrap (buildings win), and selecting a scrap pile clears any building selection. Hit-testing prefers a building over a coincident actor or scrap pile, and an actor (ship or defence station) over a coincident scrap pile: a scrap pile is selected only when no building or actor is under the cursor. A selected scrap pile that despawns or is fully collected (REQ-RES-SCRAP-DROP) is removed from the selection; if no selected object remains, the panel becomes empty (REQ-UI-EMPTY-SELECTION).
 - REQ-UI-SCRAP-MULTI-SELECT: Multiple scrap piles can be selected by box-drag or by Ctrl+clicking individual piles to add or remove them, mirroring building multi-select (REQ-UI-MULTI-SELECT). Scrap shares the field-object category with ships and defence stations (REQ-UI-SELECTION-CATEGORIES), so a field selection may hold scrap piles and actors together. Ctrl+clicking a scrap pile while a field selection is active adds or removes that pile within the same selection; Ctrl+clicking a scrap pile while a building selection is active first clears the buildings and begins a field selection (buildings win). Conversely, selecting a building while a field selection is active clears it. Box-drag disambiguation follows REQ-UI-MULTI-SELECT (a box covering any building selects buildings; a box covering no building selects the ships, defence stations, and scrap piles within it).
-- REQ-UI-SCRAP-PANEL: When one or more scrap piles are selected, the selected building panel shows the **total remaining scrap amount** across all selected piles — the sum of the piles' current remaining amounts (REQ-RES-SCRAP-DROP), e.g. "Scrap: 47". The same summed-amount display is used whether one pile or many are selected; no per-pile detail and no pile count are shown. The displayed total updates as selected piles are partially collected or despawn (REQ-UI-SCRAP-CLICK-SELECT). When actors are also selected, this scrap total is shown as an additional line of the actor count summary rather than alongside a single-actor stats panel (REQ-UI-FIELD-MULTI-SELECTION).
+- REQ-UI-SCRAP-PANEL: When one or more scrap piles are selected, the selected building panel shows the **total remaining scrap amount** across all selected piles — the sum of the piles' current remaining amounts (REQ-RES-SCRAP-DROP), e.g. "Scrap x 47". The same summed-amount display is used whether one pile or many are selected; no per-pile detail and no pile count are shown. The displayed total updates as selected piles are partially collected or despawn (REQ-UI-SCRAP-CLICK-SELECT). When actors are also selected, this scrap total is shown as an additional line of the actor count summary rather than alongside a single-actor stats panel (REQ-UI-FIELD-MULTI-SELECTION).
 
 ### Build Button Grid
 

src/ui/SelectedBuildingPanel.cpp

@@ -1197,7 +1197,7 @@ QString SelectedBuildingPanel::scrapTotalText() const
             total += info.amount;
         }
     }
-    return tr("Scrap: %1").arg(total);
+    return tr("Scrap x %1").arg(total);
 }
 
 void SelectedBuildingPanel::refreshScrapTotal()