feat(themes): warn about animated themes on high-CPU setups (#1020)

* feat(themes): warn about animated themes on high-CPU setups

Show a warning icon + tooltip on animated themes (those defining
@keyframes) in the store and in Your Themes, on Linux setups where
animation is costly — the Nvidia WebKit quirk is active or compositing
is forced off. The Nvidia detection already runs once at startup; its
result is recorded (theme_animation.rs) and read via a new
theme_animation_risk command — no GPU re-probe. Display-only; never
shown off Linux. The animated flag comes from the registry (store) or
the theme CSS (Your Themes).

* docs(themes): note the animated-theme warning PR in the Theme Store entry

src/locales/fr/settings.ts

@@ -320,6 +320,7 @@ export const settings = {
   tabThemes: 'Thèmes',
   themesYourThemesTitle: 'Vos thèmes',
   themesCvdTooltip: 'Adapté au daltonisme — deutéranopie, protanopie, tritanopie',
+  themeAnimationWarning: 'Ce thème utilise des animations qui peuvent augmenter l’utilisation du processeur sur votre configuration (Nvidia/Linux ou compositing désactivé).',
   themeStoreTitle: 'Boutique de thèmes',
   themeStoreSubmitText: "Vous avez créé votre propre thème ? Partagez-le avec la communauté — plus d'infos dans le dépôt de thèmes.",
   themeStoreSubmitLink: 'Ouvrir le dépôt de thèmes',