feat(activation): D-Bus activation for compositor global shortcuts (#568)

Rebased onto latest main (conflict-resolution squash for PR #568).

Co-authored-by: Alexander <ab@digital-benefits.de>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/test_suspend_handler.py

@@ -302,6 +302,9 @@ class TestTrayIndicatorResumeFlow(unittest.TestCase):
             indicator = TrayIndicator.__new__(TrayIndicator)
 
         indicator.speech_engine = MagicMock()
+        indicator.config_manager = MagicMock()
+        indicator.config_manager.get_bool.return_value = False
+        indicator._external_activation_unavailable = False
         indicator._setup_keyboard_shortcuts = MagicMock()
         indicator._input_monitor = None
         indicator._settle_timer_id = None
@@ -343,6 +346,19 @@ class TestTrayIndicatorResumeFlow(unittest.TestCase):
         assert calls[1][0][0] == 2
         assert calls[1][0][1] == indicator._start_input_device_monitor
 
+    @patch("vocalinux.ui.tray_indicator.GLib")
+    def test_on_system_resume_skips_monitor_for_external_activation(self, mock_glib):
+        """External activation promises no /dev/input access; a resume must
+        not open the device monitor that (re)starts the internal listener."""
+        indicator = self._make_tray_indicator()
+        indicator.config_manager.get_bool.return_value = True
+
+        indicator._on_system_resume()
+
+        calls = mock_glib.timeout_add_seconds.call_args_list
+        assert len(calls) == 1
+        assert calls[0][0][1] == indicator._reinit_speech_after_resume
+
     @patch("vocalinux.ui.tray_indicator.Gio")
     @patch("vocalinux.ui.tray_indicator.GLib")
     def test_start_input_device_monitor_sets_up_gio_monitor(self, mock_glib, mock_gio):
@@ -497,6 +513,7 @@ class TestTrayAutoPauseWiring(unittest.TestCase):
         indicator.speech_engine.reinitialize_after_resume = MagicMock()
         indicator.speech_engine.is_auto_paused = False
         indicator.config_manager = MagicMock()
+        indicator._external_activation_unavailable = False
         indicator._setup_keyboard_shortcuts = MagicMock()
         indicator._input_monitor = None
         indicator._settle_timer_id = None
@@ -565,6 +582,7 @@ class TestTrayAutoPauseWiring(unittest.TestCase):
     def test_system_resume_skips_reinit_when_auto_paused(self, mock_glib):
         indicator = self._make_tray_indicator()
         indicator.speech_engine.is_auto_paused = True
+        indicator.config_manager.get_bool.return_value = False
         indicator._start_input_device_monitor = MagicMock()
 
         indicator._on_system_resume()
@@ -578,6 +596,7 @@ class TestTrayAutoPauseWiring(unittest.TestCase):
     def test_system_resume_reinits_when_not_auto_paused(self, mock_glib):
         indicator = self._make_tray_indicator()
         indicator.speech_engine.is_auto_paused = False
+        indicator.config_manager.get_bool.return_value = False
         indicator._reinit_speech_after_resume = MagicMock()
         indicator._start_input_device_monitor = MagicMock()