fix(suspend): restart keyboard shortcut backend after resume (#371)

After suspend/resume, evdev devices disconnect and the monitor thread
exits when all file descriptors close. The resume handler only
reinitialized the speech engine, leaving keyboard shortcuts dead.

Restart _setup_keyboard_shortcuts() in _reinit_after_resume() to
re-scan /dev/input and open fresh device file descriptors.

src/vocalinux/ui/tray_indicator.py

@@ -476,6 +476,15 @@ class TrayIndicator:
             self.speech_engine.reinitialize_after_resume()
         except Exception:
             logger.error("Failed to reinitialize after resume", exc_info=True)
+
+        # evdev devices disconnect on suspend; monitor thread exits when all fds close.
+        # Full stop+start re-scans /dev/input and opens fresh file descriptors.
+        try:
+            logger.info("Restarting keyboard shortcuts after resume")
+            self._setup_keyboard_shortcuts()
+        except Exception:
+            logger.error("Failed to restart keyboard shortcuts after resume", exc_info=True)
+
         return GLib.SOURCE_REMOVE
 
     def _on_quit_clicked(self, widget):