Fix song/application access: property not method call

ControlSurface exposes song and application as properties, not callable
methods. Replace manager.song() and manager.application() with the correct
attribute access throughout handler, application, browser, and view modules.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

AbletonOSC/application.py

@@ -17,7 +17,7 @@ class ApplicationHandler(AbletonOSCHandler):
 
     def _app(self):
         try:
-            return self.manager.application()
+            return self.manager.application
         except Exception:
             return None
 

AbletonOSC/browser.py

@@ -46,7 +46,7 @@ class BrowserHandler(AbletonOSCHandler):
 
     def _browser(self):
         try:
-            return self.manager.application().browser
+            return self.manager.application.browser
         except Exception:
             return None
 

AbletonOSC/handler.py

@@ -14,7 +14,7 @@ class AbletonOSCHandler:
 
     @property
     def song(self):
-        return self.manager.song()
+        return self.manager.song
 
     # ------------------------------------------------------------------
     # Registration helpers

AbletonOSC/view.py

@@ -184,7 +184,7 @@ class ViewHandler(AbletonOSCHandler):
 
     def _show_clip_detail_view(self, params: tuple) -> None:
         try:
-            app = self.manager.application()
+            app = self.manager.application
             app.view.show_view("Detail/Clip")
         except Exception as e:
             logger.warning("show_clip_detail_view: %s", e)
@@ -192,7 +192,7 @@ class ViewHandler(AbletonOSCHandler):
 
     def _show_device_detail_view(self, params: tuple) -> None:
         try:
-            app = self.manager.application()
+            app = self.manager.application
             app.view.show_view("Detail/DeviceChain")
         except Exception as e:
             logger.warning("show_device_detail_view: %s", e)
@@ -200,7 +200,7 @@ class ViewHandler(AbletonOSCHandler):
 
     def _focus_browser(self, params: tuple) -> None:
         try:
-            app = self.manager.application()
+            app = self.manager.application
             app.view.show_view("Browser")
         except Exception as e:
             logger.warning("focus_browser: %s", e)
@@ -208,7 +208,7 @@ class ViewHandler(AbletonOSCHandler):
 
     def _get_focused_document_view(self, params: tuple) -> Optional[tuple]:
         try:
-            app = self.manager.application()
+            app = self.manager.application
             view = app.view.focused_document_view
             return (view,)
         except Exception as e: