fix: apply clang-format and exclude third-party libraries from formatting checks

- Applied clang-format to fix formatting violations in TUI and other source files
- Updated CMakeLists.txt to exclude src/lib/* from format targets to prevent third-party library violations
- Fixes clang-format violations in chat_tui.cc, tui.cc, and unified_layout.cc
- All source files now pass format-check target

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

test/e2e/dungeon_editor_smoke_test.cc

@@ -1,11 +1,12 @@
 #include "e2e/dungeon_editor_smoke_test.h"
+
 #include "app/controller.h"
 #include "imgui_test_engine/imgui_te_context.h"
 #include "test_utils.h"
 
 /**
  * @brief Quick smoke test for DungeonEditorV2
- * 
+ *
  * Tests the card-based architecture:
  * - Independent windows (cards) can be opened/closed
  * - Room cards function correctly