Reshape game-world selection into two categories: buildings (exclusive,
win all ties) and field objects (ships, defence stations, scrap) that
coexist. Ships/stations are now multi-selectable via Ctrl+click and
box-drag and can be selected together with scrap; the Selected panel
shows a single-actor stats panel or a multi-actor summary plus the scrap
total.
- Widen EntitySelectedEvent to std::vector<entt::entity>
- Add actorsInBox() ECS query (+ Catch2 test)
- GameWorldView: vector actor selection, building>actor>scrap hit-test,
actor Ctrl-toggle/box-select, membership highlights, per-frame prune
- SelectedBuildingPanel: buildFieldSelection composition, buildEntitySummary
- ArenaView/InspectWindow: adapt to vector payload (single-select)
Implements REQ-UI-SELECTION-CATEGORIES, REQ-UI-FIELD-MULTI-SELECTION and
the updated entity/scrap selection requirements.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc
