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/unit/gfx/snes_tile_test.cc

@@ -43,8 +43,9 @@ TEST(SnesTileTest, UnpackBppTile) {
   EXPECT_EQ(tile2bpp.data[63], 3);  // Last pixel: 1|1<<1 = 3
 
   // Test 4bpp tile unpacking
-  // According to SnesLab: First planes 1&2 intertwined, then planes 3&4 intertwined
-  // 32 bytes total: 16 bytes for planes 1&2, then 16 bytes for planes 3&4
+  // According to SnesLab: First planes 1&2 intertwined, then planes 3&4
+  // intertwined 32 bytes total: 16 bytes for planes 1&2, then 16 bytes for
+  // planes 3&4
   std::vector<uint8_t> data4bpp = {
       // Planes 1&2 intertwined (rows 0-7)
       0x81, 0x80,  // Row 0: bp1=10000001, bp2=10000000