feat(editor): preview del brush d'entitat i fons del picker mes clar

source/game/editor/editor.cpp

@@ -1092,6 +1092,28 @@ void Editor::updateTilePicker(const Tilemap& tilemap, int canvas_x, int canvas_y
     }
 }
 
+void Editor::renderEntityBrushPreview(const Tilemap& tilemap) const {
+    auto it = std::ranges::find_if(editable_entities_, [this](const auto& e) { return e.name == brush_entity_; });
+    if (it == editable_entities_.end() || it->sprite == nullptr) { return; }
+    const int FRAME = (brush_entity_frame_ >= 0) ? brush_entity_frame_ : 0;
+    const int ATLAS_COLS = (it->frame_w > 0) ? (it->sprite->getWidth() / it->frame_w) : 1;
+    const int ATLAS_COLS_SAFE = (ATLAS_COLS > 0) ? ATLAS_COLS : 1;
+    const int A_COL = FRAME % ATLAS_COLS_SAFE;
+    const int A_ROW = FRAME / ATLAS_COLS_SAFE;
+    const SDL_FRect SRC{
+        .x = static_cast<float>(A_COL * it->frame_w),
+        .y = static_cast<float>(A_ROW * it->frame_h),
+        .w = static_cast<float>(it->frame_w),
+        .h = static_cast<float>(it->frame_h),
+    };
+    const int TS = tilemap.getTileSize();
+    const int TILE_PX = tilemap.getOriginX() + (cursor_col_ * TS);
+    const int TILE_PY = tilemap.getOriginY() + (cursor_row_ * TS);
+    const int DST_X = TILE_PX + ((TS - it->frame_w) / 2);
+    const int DST_Y = TILE_PY + TS - it->frame_h;
+    it->sprite->render(DST_X, DST_Y, &SRC, SDL_FLIP_NONE);
+}
+
 void Editor::render(const Tilemap& tilemap, const EntityManager& entities) const {
     if (!active_) { return; }
     auto& screen = Screen::get();
@@ -1109,6 +1131,8 @@ void Editor::render(const Tilemap& tilemap, const EntityManager& entities) const
         const int PX = tilemap.getOriginX() + (cursor_col_ * tilemap.getTileSize());
         const int PY = tilemap.getOriginY() + (cursor_row_ * tilemap.getTileSize());
         tilemap.renderTilePreview(PX, PY, brush_tile_);
+    } else if (mode_ == Mode::ENTITY && !brush_entity_.empty() && cursor_col_ >= 0 && cursor_row_ >= 0) {
+        renderEntityBrushPreview(tilemap);
     } else if (mode_ == Mode::HAND && picker_ == Picker::NONE) {
         // Marcs d'entitat: hover (tenue) i selecció (brillant). El
         // pickerHoverArgb el reusem com a "selecció brillant"; el

source/game/editor/editor.hpp

@@ -145,6 +145,12 @@ class Editor {
     void renderEntityPicker(const Tilemap& tilemap) const;
     void renderEntityFramePicker() const;
 
+    // Preview del sprite de l'entitat seleccionada com a brush, snapped al
+    // tile sota el cursor. Anchor "feet": base del sprite a la base inferior
+    // del tile, centrat horitzontalment — així stone cau exactament i column
+    // sobresurt cap amunt, coincidint amb el resultat de col·locar.
+    void renderEntityBrushPreview(const Tilemap& tilemap) const;
+
     bool active_{false};
     Mode mode_{Mode::TILE};
     Picker picker_{Picker::NONE};