refactor: simplify agenda icon usage across components

- Removed dark mode icon references for the agenda in landing-data, favorite-apps, and suite-app-splash files.
- Consolidated agenda icon handling in agenda-mark component to use a single light icon, improving code maintainability and reducing redundancy.

components/landing/landing-data.ts

@@ -124,7 +124,6 @@ export const LANDING_APPS: LandingApp[] = [
     description:
       "Calendrier partagé, invitations et disponibilités, connecté au mail et aux contacts.",
     icon: suitePublicAsset("/agenda-mark.svg"),
-    iconDark: suitePublicAsset("/agenda-mark-dark.svg"),
     href: "/agenda",
     productHref: "/suite/ultical",
     accent: "#FBBC04",

components/suite/agenda-mark.tsx

@@ -1,8 +1,7 @@
 import { suitePublicAsset } from "@/lib/suite/suite-public-asset"
 import { cn } from "@/lib/utils"
 
-const AGENDA_MARK_LIGHT = suitePublicAsset("/agenda-mark.svg")
-const AGENDA_MARK_DARK = suitePublicAsset("/agenda-mark-dark.svg")
+const AGENDA_MARK = suitePublicAsset("/agenda-mark.svg")
 
 export function AgendaMark({
   className,
@@ -12,21 +11,12 @@ export function AgendaMark({
   alt?: string
 }) {
   return (
-    <>
     <img
-        src={AGENDA_MARK_LIGHT}
+      src={AGENDA_MARK}
       alt={alt}
-        className={cn(className, "dark:hidden")}
+      className={cn(className)}
       draggable={false}
       aria-hidden={alt === ""}
     />
-      <img
-        src={AGENDA_MARK_DARK}
-        alt={alt}
-        className={cn(className, "hidden dark:block")}
-        draggable={false}
-        aria-hidden={alt === ""}
-      />
-    </>
   )
 }

lib/suite/favorite-apps.ts

@@ -17,7 +17,6 @@ export const SUITE_FAVORITE_APPS: FavoriteApp[] = [
   {
     name: ULTICAL_APP_NAME,
     icon: suitePublicAsset("/agenda-mark.svg"),
-    iconDark: suitePublicAsset("/agenda-mark-dark.svg"),
     href: "/agenda",
   },
   { name: "Photos", icon: suitePublicAsset("/photos-mark.svg") },

lib/suite/suite-app-splash.ts

@@ -9,7 +9,6 @@ const LEGACY_MAIL_SPLASH_KEY = "ultimail-splash-seen-v1"
 export type SuiteSplashConfig = {
   pill: string
   mark: string
-  /** UltiCal : variante dark mode. */
   markDark?: string
   subtitle: string
   ariaLabel: string
@@ -33,7 +32,6 @@ export const SUITE_SPLASH_CONFIG: Record<SuiteSplashApp, SuiteSplashConfig> = {
   agenda: {
     pill: "ULTICAL",
     mark: "/agenda-mark.svg",
-    markDark: "/agenda-mark-dark.svg",
     subtitle: "Chargement de votre agenda...",
     ariaLabel: `Chargement d'${ULTICAL_APP_NAME}`,
     spinMark: true,