feat: add reduce motion settings and update related UI components

frontend/src/lib/stores/settings.svelte.ts

@@ -15,6 +15,7 @@ const defaults: EMLy_GUI_Settings = {
     useDarkEmailViewer: true,
     enableUpdateChecker: false,
     musicInspirationEnabled: false,
+    reduceMotion: false,
     theme: "dark",
 };
 

frontend/src/lib/types.d.ts

@@ -11,6 +11,7 @@ interface EMLy_GUI_Settings {
     useDarkEmailViewer?: boolean;
     enableUpdateChecker?: boolean;
     musicInspirationEnabled?: boolean;
+    reduceMotion?: boolean;
     theme?: "light" | "dark";
 }