Fix Hyprland service initialization and property handling

[DIMFLIX]

This commit resolves issue #87 by:

1. Explicitly defining GObject properties via gproperties before super().init()
2. Implementing do_get_property for proper property access
3. Replacing direct property access with get_property() calls in widgets
4. Adding proper error handling during service initialization

The changes ensure proper GObject property system integration and prevent critical "string_to_string: assertion 'self != NULL' failed" errors that occurred during service initialization.