preloader: override Frappe desk splash image

CSS swaps the <img> inside templates/includes/splash_screen.html via
content: url(...) so the desk loading screen shows our PNG instead of
the default blue "E" framework logo. Image lives at
public/images/preloader.png — served via the existing assets symlink,
no bench build needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

jey_theme/public/css/shared.css

@@ -2,6 +2,15 @@
    Jey Theme — Shared Styles (theme-independent)
    ========================================================================== */
 
+/* Override Frappe's default desk splash image (the blue "E").
+   Splash markup is in templates/includes/splash_screen.html and gets removed
+   by Frappe once the desk boots, so this only shows during page load. */
+.splash img {
+	content: url("/assets/jey_theme/images/preloader.png");
+	max-width: 200px;
+	height: auto;
+}
+
 /* Hide Organization desktop icon by default */
 .desktop-icon[data-id="Organization"] {
 	display: none !important;