make EntityAdmin::hasAll const

Asking whether an entity has components does not write to the registry, and
entt's all_of is const. Callers that only read were forced to take the admin --
and through it the whole simulation -- by non-const reference to ask; the
selection bounds helpers now say what they mean.

Widening a member to const breaks nothing: every existing caller still binds.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JcReq7hVk4KUPhTDKWAG7K

src/ui/SelectionBounds.h

@@ -29,22 +29,20 @@ std::optional<QRectF> getBuildingWidgetRect(const FactoryState& state,
                                             BuildingId id);
 
 // The body of a ship or of a defence station (REQ-UI-ENTITY-CLICK-SELECT): a station's
-// footprint, or the square the ship's triangle is drawn in. The admin is taken by
-// non-const reference only because EntityAdmin::hasAll() is not const; nothing here
-// writes to it.
-std::optional<QRectF> getActorWidgetRect(EntityAdmin& admin,
+// footprint, or the square the ship's triangle is drawn in.
+std::optional<QRectF> getActorWidgetRect(const EntityAdmin& admin,
                                          const WorldCoordinates& coordinates,
                                          entt::entity actor);
 
 // The circle a piece of debris is drawn as (REQ-UI-DEBRIS-CLICK-SELECT).
-std::optional<QRectF> getDebrisWidgetRect(EntityAdmin& admin,
+std::optional<QRectF> getDebrisWidgetRect(const EntityAdmin& admin,
                                           const WorldCoordinates& coordinates,
                                           entt::entity debris);
 
 // The rectangle covering a whole selection -- one object, or the bounding box of all of
 // them (REQ-UI-SELECTION-PANEL). Objects that no longer resolve are skipped; the result
 // is null when none of them does.
-QRect getSelectionWidgetRect(Simulation& sim, const WorldCoordinates& coordinates,
+QRect getSelectionWidgetRect(const Simulation& sim, const WorldCoordinates& coordinates,
                              const std::vector<BuildingId>& buildings,
                              const std::vector<entt::entity>& actors,
                              const std::vector<entt::entity>& debris);