refactor: Improve Editor Management and UI Consistency

- Removed PushID and PopID calls in EditorManager to prevent ID stack corruption, relying on window titles for uniqueness.
- Updated ImGui window size and position settings to use FirstUseEver for maximizing on first open, enhancing user experience.
- Replaced AgentUI::PopPanelStyle with ImGui::PopStyleColor in multiple locations for consistency in style management.
- Ensured all EditorCard instances consistently call End after Begin, improving code clarity and preventing potential rendering issues.

src/app/editor/dungeon/dungeon_editor_v2.cc

@@ -140,8 +140,8 @@ void DungeonEditorV2::DrawLayout() {
     gui::EditorCard room_card(card_name, ICON_MD_GRID_ON, &open);
     if (room_card.Begin()) {
       DrawRoomTab(room_id);
-      room_card.End();
     }
+    room_card.End();  // ALWAYS call End after Begin
 
     if (!open) {
       active_rooms_.erase(active_rooms_.Data + i);