Progress SAve- downloader,blur,ghost mode(Partially) works

assets/scripts/theme_detector.js

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+/**
+ * FocusGram Theme Detector
+ * Reads light/dark theme from page and bridges to Flutter.
+ * Injected at DOCUMENT_END.
+ */
+(function () {
+  'use strict';
+
+  (function fgThemeSync() {
+    if (window.__fgThemeSyncRunning) return;
+    window.__fgThemeSyncRunning = true;
+
+    function getTheme() {
+      try {
+        const h = document.documentElement;
+        if (h.classList.contains('style-dark')) return 'dark';
+        if (h.classList.contains('style-light')) return 'light';
+
+        const bg = window.getComputedStyle(document.body).backgroundColor;
+        const rgb = bg.match(/\d+/g);
+        if (rgb && rgb.length >= 3) {
+          const luminance =
+            (0.299 * rgb[0] + 0.587 * rgb[1] + 0.114 * rgb[2]) / 255;
+          return luminance < 0.5 ? 'dark' : 'light';
+        }
+      } catch (_) {}
+      return 'dark';
+    }
+
+    let last = '';
+    function check() {
+      const current = getTheme();
+      if (current !== last) {
+        last = current;
+        if (window.flutter_inappwebview) {
+          window.flutter_inappwebview.callHandler(
+            'FocusGramThemeChannel',
+            current
+          );
+        }
+      }
+    }
+
+    setInterval(check, 1500);
+    check();
+  })();
+})();