Prevent screen turning off during playback

Closes: #157

XDG portals expose a D-Bus interface allowing apps to prevent screen
idling, user switching, and other actions. That interface,
org.freedesktop.portal.Inhibit, does all of the heavy lifting here.

Idling = the screen dimming or shutting off.

Idling is inhibited when a video is actively playing.
Idling is NOT inhibited when videos aren't playing - this includes
paused or stopped videos.

src/localize.rs

@@ -4,8 +4,8 @@ use std::str::FromStr;
 use std::sync::OnceLock;
 
 use i18n_embed::{
-    fluent::{fluent_language_loader, FluentLanguageLoader},
     DefaultLocalizer, LanguageLoader, Localizer,
+    fluent::{FluentLanguageLoader, fluent_language_loader},
 };
 use icu_collator::{Collator, CollatorOptions, Numeric};
 use icu_provider::DataLocale;