[Bug] Image preview in notification is blank or shows error when there's a space in the filename.

[deadbody13]

Description
Images from screenshot-related notifications are blank or show an error when there's a space in the filename.

To Reproduce

1. (In Niri) Run niri screenshot utility with filename Screenshot from %Y-%m-%d %H-%M-%S.png.

Expected behavior
Notification appears in top right corner labeled "Screenshot Captured" with a preview of the captured image showing in the body text.

Please provide logs if you're experiencing notification errors / bugs

** (swaync:105781): DEBUG: 15:37:16.978: notiDaemon.vala:171: Notification: 
category:		(null)
image_data:		false
expire_timeout:		-1
replaces_id:		0
desktop_entry:		(null)
body:			You can paste the image from the clipboard.
app_icon:		file:///home/sven/Pictures/Screenshots/Screenshot%20from%202025-01-31%2015-37-16.png
action_icons:		false
time:			1738355836
hints:		
	urgency: byte 0x01
	transient: true
applied_id:		1
image_path:		(null)
inline-reply:		(null)
app_name:		niri
summary:		Screenshot captured
icon_data:		false
resident:		false
default_action:		(null)
actions:		
urgency:		Normal

Failed to open file “/home/sven/Pictures/Screenshots/Screenshot%20from%202025-01-31%2015-37-16.png”: No such file or directory

Screenshots

Desktop (please complete the following information):

• OS: Fedora 41
• Version: Workstation
• DE/WM: Niri

Additional context
This isn't a huge issue but it was causing me problems for a while until I debugged it with G_MESSAGES_DEBUG=all swaync. Now I've replaced any with _ and that's mitigated the issue but thought it was still worth bringing up.