Refactor: using Path instead of join

builder/frameworks/component_manager.py

@@ -577,7 +577,9 @@ def _get_lib_ignore_entries(self) -> List[str]:
                 'spi_flash',      # Flash memory access
                 'esp_timer',      # Timer functions
                 'esp_event',      # Event system
-                'log'             # Logging system
+                'log',            # Logging system
+                'arduino_tinyusb', # Arduino TinyUSB library
+                'tinyusb'         # TinyUSB library
             ]
 
             filtered_entries = []
@@ -808,7 +810,10 @@ def _map_library_to_include_path(self, lib_name: str, dir_name: str) -> str:
             'esptouch': 'esp_smartconfig',
             'ping': 'lwip',
             'netif': 'lwip',
-            'tcpip': 'lwip'
+            'tcpip': 'lwip',
+            'usb': 'arduino_tinyusb',
+            'tinyusb': 'arduino_tinyusb',
+            'arduino_tinyusb': 'arduino_tinyusb'
         }
 
         # Check extended mapping first
@@ -837,7 +842,7 @@ def _convert_lib_name_to_include(self, lib_name: str) -> str:
             Converted include directory name for path removal
         """
         # Load Arduino Core Libraries on first call
-        if not hasattr(self, '_arduino_libraries_cache'):
+        if self._arduino_libraries_cache is None:
             self._arduino_libraries_cache = self._get_arduino_core_libraries()
 
         lib_name_lower = lib_name.lower()