Fix level-select dropdown loading into game instead of editor

When the editor is active, the JS shell level-select dropdown was
unconditionally switching to MODE_PLAY. Now it detects MODE_EDITOR
and calls editor_load() to load the selected level into the editor.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main.c

@@ -440,6 +440,18 @@ static void game_update(float dt) {
     /* Handle deferred level load from JS shell dropdown. */
     if (s_js_load_request && s_js_load_path[0]) {
         s_js_load_request = 0;
+
+        if (s_mode == MODE_EDITOR) {
+            /* Load the selected level into the editor, not gameplay. */
+            if (!editor_load(&s_editor, s_js_load_path)) {
+                fprintf(stderr, "Failed to load level in editor: %s\n",
+                        s_js_load_path);
+            }
+            snprintf(s_edit_path, sizeof(s_edit_path), "%s", s_js_load_path);
+            s_js_load_path[0] = '\0';
+            return;
+        }
+
         end_session("quit");
 
         /* Tear down whatever mode we are in. */
@@ -447,8 +459,6 @@ static void game_update(float dt) {
             || s_mode == MODE_TRANSITION) {
             transition_reset(&s_transition);
             level_free(&s_level);
-        } else if (s_mode == MODE_EDITOR) {
-            editor_free(&s_editor);
         }
 
         s_mode = MODE_PLAY;