feat(editor): mode editor mínim amb toggle, border blau i mutex amb pausa

source/game/editor/editor.cpp

@@ -0,0 +1,59 @@
+#include "game/editor/editor.hpp"
+
+#ifdef _DEBUG
+
+#include <SDL3/SDL.h>
+
+#include "core/locale/locale.hpp"
+#include "core/rendering/notification_presets.hpp"
+#include "core/rendering/screen.hpp"
+#include "game/map/tilemap.hpp"
+#include "utils/defaults.hpp"
+#include "utils/defines.hpp"
+
+void Editor::enter() {
+    if (active_) { return; }
+    active_ = true;
+    Notification::notify(Locale::get().text("input.editor_on"));
+}
+
+// cppcheck-suppress constParameterReference
+// Tilemap& mutable per simetria amb `toggle()` i per futures
+// invalidacions de caches d'edició, encara que `save()` sigui const.
+void Editor::exit(Tilemap& tilemap) {
+    if (!active_) { return; }
+    active_ = false;
+    const bool SAVED = tilemap.save(Defaults::Editor::SAVE_PATH);
+    Notification::notify(Locale::get().text(SAVED ? "input.editor_off" : "input.editor_save_error"));
+}
+
+void Editor::toggle(Tilemap& tilemap) {
+    if (active_) {
+        exit(tilemap);
+    } else {
+        enter();
+    }
+}
+
+// cppcheck-suppress constParameterReference
+// Tilemap& mutable: al pas següent `setTileAt()` (no const) el muta.
+void Editor::update(int /*delta_ms*/, Tilemap& tilemap) {
+    if (!active_) { return; }
+    cursor_col_ = -1;
+    cursor_row_ = -1;
+    (void)tilemap;  // TODO: brush + click + picker al pas següent.
+}
+
+void Editor::render(const Tilemap& /*tilemap*/) const {
+    if (!active_) { return; }
+    auto& screen = Screen::get();
+    constexpr int W = GameCanvas::WIDTH;
+    constexpr int H = GameCanvas::HEIGHT;
+    constexpr auto ARGB = Defaults::Editor::BORDER_ARGB;
+    screen.fillRect(0, 0, W, 1, ARGB);      // top
+    screen.fillRect(0, H - 1, W, 1, ARGB);  // bottom
+    screen.fillRect(0, 0, 1, H, ARGB);      // left
+    screen.fillRect(W - 1, 0, 1, H, ARGB);  // right
+}
+
+#endif  // _DEBUG