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/testing.h

@@ -23,9 +23,7 @@ namespace test {
 
 // StatusIs is a matcher that matches a status that has the same code and
 // message as the expected status.
-MATCHER_P(StatusIs, status, "") {
-  return arg.code() == status;
-}
+MATCHER_P(StatusIs, status, "") { return arg.code() == status; }
 
 // Support for testing absl::StatusOr.
 template <typename T>
@@ -42,9 +40,7 @@ template <typename T>
   return ::testing::AssertionSuccess();
 }
 
-MATCHER_P(IsOkAndHolds, value, "") {
-  return IsOkAndHolds(arg, value);
-}
+MATCHER_P(IsOkAndHolds, value, "") { return IsOkAndHolds(arg, value); }
 
 // Helper to test if a StatusOr contains an error with a specific message
 MATCHER_P(StatusIsWithMessage, message, "") {