Fix docstring style: use regular hyphen instead of em dash for consistency

Agent-Logs-Url: https://github.com/AKArien/newsflash/sessions/a6a36235-533e-48bf-8027-814233792cda

Co-authored-by: AKArien <154227120+AKArien@users.noreply.github.com>

Author: Copilot

config.py

@@ -1,4 +1,4 @@
-"""newsflash.config — Configuration loading and inotify-based hot-reload."""
+"""newsflash.config - Configuration loading and inotify-based hot-reload."""
 
 from __future__ import annotations
 

flasher.py

@@ -1,4 +1,4 @@
-"""newsflash.flasher — LED device discovery and brightness animation."""
+"""newsflash.flasher - LED device discovery and brightness animation."""
 
 from __future__ import annotations
 

newsflash.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""newsflash — D-Bus notification listener that flashes keyboard LEDs.
+"""newsflash - D-Bus notification listener that flashes keyboard LEDs.
 
 Eavesdrops on the session bus for org.freedesktop.Notifications.Notify and
 triggers a brightness animation on matched LED devices for each notification.