[Feature] Add autologin support (#841) (closes #200)

This is the simplest change I could come up with to add working autologin, only bit I really dislike is the event but it seemed like the cleanest way without refactoring.

Co-authored-by: ferreo <harderthanfire@gmail.com>
Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/841
Reviewed-by: AnErrupTion <anerruption@disroot.org>
Co-authored-by: ferreo <ferreo@noreply.codeberg.org>
Co-committed-by: ferreo <ferreo@noreply.codeberg.org>

src/config/Lang.zig

@@ -9,6 +9,7 @@ brightness_up: []const u8 = "increase brightness",
 capslock: []const u8 = "capslock",
 custom: []const u8 = "custom",
 err_alloc: []const u8 = "failed memory allocation",
+err_autologin_session: []const u8 = "autologin session not found",
 err_bounds: []const u8 = "out-of-bounds index",
 err_brightness_change: []const u8 = "failed to change brightness",
 err_chdir: []const u8 = "failed to open home folder",