diff --git a/code/th_02_core.js b/code/th_02_core.js
index 1e370cd..77575a0 100644
--- a/code/th_02_core.js
+++ b/code/th_02_core.js
@@ -43,6 +43,8 @@ function FloatBallAppWM(logger) {
     viewerPanelLp: null,
     viewerPanelType: null,
     panelBackCallbackEntries: [],
+    predictiveBackIndicatorView: null,
+    predictiveBackIndicatorLp: null,
 
     // 设置类 UI App 化：单窗口页面栈（settings -> 子页面 -> 编辑页）
     toolAppActive: false,
diff --git a/code/th_09_animation.js b/code/th_09_animation.js
index 62ce117..4e6982d 100644
--- a/code/th_09_animation.js
+++ b/code/th_09_animation.js
@@ -266,13 +266,77 @@ FloatBallAppWM.prototype.handleSystemUiDismiss = function(reason) {
   return false;
 };
 
+FloatBallAppWM.prototype.hidePanelPredictiveBackIndicator = function() {
+  try {
+    var v = this.state.predictiveBackIndicatorView;
+    if (v && this.state.wm) {
+      try { this.state.wm.removeView(v); } catch (eRm) {}
+    }
+    this.state.predictiveBackIndicatorView = null;
+    this.state.predictiveBackIndicatorLp = null;
+  } catch (e) {}
+};
+
+FloatBallAppWM.prototype.showPanelPredictiveBackIndicator = function(edge) {
+  try {
+    if (!this.state.wm) return null;
+    var v = this.state.predictiveBackIndicatorView;
+    var lp = this.state.predictiveBackIndicatorLp;
+    var size = this.dp(46);
+    var edgeLeft = Number(edge) !== 1;
+    if (!v) {
+      v = new android.widget.TextView(context);
+      v.setText(edgeLeft ? "‹" : "›");
+      v.setTextSize(android.util.TypedValue.COMPLEX_UNIT_SP, 30);
+      v.setTypeface(null, android.graphics.Typeface.BOLD);
+      v.setGravity(android.view.Gravity.CENTER);
+      v.setTextColor(android.graphics.Color.WHITE);
+      try {
+        var bg = new android.graphics.drawable.GradientDrawable();
+        bg.setShape(android.graphics.drawable.GradientDrawable.OVAL);
+        var c = (this.ui && this.ui.colors && this.ui.colors.primary) ? this.ui.colors.primary : android.graphics.Color.parseColor("#005BC0");
+        bg.setColor(this.withAlpha ? this.withAlpha(c, 0.92) : c);
+        v.setBackground(bg);
+        v.setElevation(this.dp(12));
+      } catch (eBg) {}
+      lp = new android.view.WindowManager.LayoutParams(
+        size,
+        size,
+        android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
+        android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
+          android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE |
+          android.view.WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
+        android.graphics.PixelFormat.TRANSLUCENT
+      );
+      lp.gravity = (edgeLeft ? android.view.Gravity.START : android.view.Gravity.END) | android.view.Gravity.CENTER_VERTICAL;
+      lp.x = this.dp(6);
+      lp.y = 0;
+      v.setAlpha(0);
+      try { this.state.wm.addView(v, lp); } catch (eAdd) { return null; }
+      this.state.predictiveBackIndicatorView = v;
+      this.state.predictiveBackIndicatorLp = lp;
+    } else {
+      try { v.setText(edgeLeft ? "‹" : "›"); } catch (eTxt) {}
+      if (lp) {
+        lp.gravity = (edgeLeft ? android.view.Gravity.START : android.view.Gravity.END) | android.view.Gravity.CENTER_VERTICAL;
+      }
+    }
+    return v;
+  } catch (e) {
+    safeLog(this.L, 'w', "show predictive back indicator fail: " + String(e));
+  }
+  return null;
+};
+
 FloatBallAppWM.prototype.resetPanelPredictiveBackVisual = function(panel) {
   try {
-    if (!panel) return;
-    panel.setAlpha(1.0);
-    panel.setTranslationX(0);
-    panel.setScaleX(1.0);
-    panel.setScaleY(1.0);
+    if (panel) {
+      panel.setAlpha(1.0);
+      panel.setTranslationX(0);
+      panel.setScaleX(1.0);
+      panel.setScaleY(1.0);
+    }
+    this.hidePanelPredictiveBackIndicator();
   } catch (e) {}
 };
 
@@ -292,6 +356,15 @@ FloatBallAppWM.prototype.applyPanelPredictiveBackProgress = function(panel, even
     var s = 1.0 - 0.025 * p;
     panel.setScaleX(s);
     panel.setScaleY(s);
+
+    // overlay 窗口下系统自己的预测性返回箭头在部分 ColorOS 版本不可见，额外绘制一个轻量边缘提示。
+    var ind = this.showPanelPredictiveBackIndicator(edge);
+    if (ind) {
+      ind.setAlpha(Math.min(1.0, 0.20 + 0.80 * p));
+      ind.setScaleX(0.82 + 0.22 * p);
+      ind.setScaleY(0.82 + 0.22 * p);
+      ind.setTranslationX(dir * this.dp(18) * p);
+    }
   } catch (e) {}
 };
 
diff --git a/manifest.json b/manifest.json
index efed64e..6db5d1d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,8 +6,8 @@
       "size": 52546
     },
     "th_02_core.js": {
-      "sha256": "2274feddccb87873d81ac0337e14de9998bb9fa8600cccfe16cbc4552d05284b",
-      "size": 4237
+      "sha256": "72c208f17d79c35926f30ab00482f0cf901d7aa42a2c703836e35b6d9953840a",
+      "size": 4313
     },
     "th_03_icon.js": {
       "sha256": "717f7f37474d3616c2cd944581455f600020a850ec8812100d0546ec1302c987",
@@ -34,8 +34,8 @@
       "size": 7938
     },
     "th_09_animation.js": {
-      "sha256": "f7083cbbc1b3efad1dcbccf19185cf1ee530172164da40f94dadc50fc5e3d763",
-      "size": 31917
+      "sha256": "35cb81040678cfb164992f1369fdb303424457fafa6a6fe0c74cbf9736f1263d",
+      "size": 34943
     },
     "th_10_shell.js": {
       "sha256": "0ed793079c2f6ba7d29f4c0d411705cb72419f45f572cbe37ed32ac16527a8bc",
@@ -68,5 +68,5 @@
   },
   "keyId": "toolhub-targets-2026-rsa3072",
   "schema": 2,
-  "version": 20260512124303
+  "version": 20260512232015
 }
diff --git a/manifest.sig b/manifest.sig
index d617dda..421429c 100644
--- a/manifest.sig
+++ b/manifest.sig
@@ -1 +1 @@
-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