Set dynamic theme color for PWA and Android status bar.

Added logic to update the theme-color meta tag dynamically based on the active theme. This improves the visual consistency of the application, particularly for PWA and Android users. Default theme color has also been updated in the configuration.

frontend/src/styles/themes.js

@@ -195,6 +195,32 @@ export const THEMES = {
 
 export const DEFAULT_THEME_KEY = "default";
 
+export function setThemeColorMeta(color) {
+  try {
+    const safe = typeof color === "string" ? color.trim() : "";
+    if (!safe) return;
+
+    // only allow solid colors (hex, rgb, hsl); ignore urls/gradients/rgba overlays
+    const looksSolid =
+      safe.startsWith("#") ||
+      safe.startsWith("rgb(") ||
+      safe.startsWith("hsl(") ||
+      safe.startsWith("oklch(");
+
+    if (!looksSolid) return;
+
+    let meta = document.querySelector('meta[name="theme-color"]');
+    if (!meta) {
+      meta = document.createElement("meta");
+      meta.setAttribute("name", "theme-color");
+      document.head.appendChild(meta);
+    }
+    meta.setAttribute("content", safe);
+  } catch {
+    // ignore
+  }
+}
+
 export function applyTheme(themeKey) {
   const t = THEMES[themeKey] || THEMES[DEFAULT_THEME_KEY];
   const root = document.documentElement;
@@ -202,6 +228,10 @@ export function applyTheme(themeKey) {
   for (const [k, v] of Object.entries(t.tokens)) {
     root.style.setProperty(`--hp-${k}`, v);
   }
+
+  // ✅ PWA/Android Statusbar dynamisch an Theme anpassen
+  // Nimmt (falls vorhanden) statusBarColor, sonst pageBg
+  setThemeColorMeta(t.tokens.statusBarColor || t.tokens.pageBg || "#000000");
 }
 
 export function themeStorageKey(email) {