diff --git a/code/th_15_extra.js b/code/th_15_extra.js
index 4fe5d5a..fe80de4 100644
--- a/code/th_15_extra.js
+++ b/code/th_15_extra.js
@@ -620,6 +620,14 @@ FloatBallAppWM.prototype.buildToolAppPreviewBody = function(entry) {
   var hasOldGroupKey = false;
   var r = "settings";
   try {
+    var spec = null;
+    try {
+      spec = this.getToolAppResponsiveSpec ? this.getToolAppResponsiveSpec() : null;
+    } catch(eSpec) {
+      spec = null;
+    }
+    var topBarHeight = spec ? spec.topBarHeight : this.dp(56);
+
     oldGroupKey = this.state.settingsGroupKey;
     hasOldGroupKey = true;
     var groupKey = null;
@@ -829,10 +837,15 @@ FloatBallAppWM.prototype.applyToolAppBackPreviewProgress = function(edge, progre
     if (isNaN(p)) p = 0;
     if (p < 0) p = 0;
     if (p > 1) p = 1;
-    if (!this.prepareToolAppBackPreview(edge)) return false;
+    var previewReady = false;
+    try {
+      previewReady = this.prepareToolAppBackPreview(edge);
+    } catch(ePrepare) {
+      previewReady = false;
+    }
     var eased = 1 - Math.pow(1 - p, 2.2);
     var body = this.state.toolAppBody;
-    var prev = this.state.toolAppBackPreviewView;
+    var prev = previewReady ? this.state.toolAppBackPreviewView : null;
     var dir = Number(edge) === 1 ? -1 : 1;
     var w = 0;
     try { w = Number((this.state.viewerPanelLp && this.state.viewerPanelLp.width) || 0); } catch (eW0) {}
@@ -845,6 +858,20 @@ FloatBallAppWM.prototype.applyToolAppBackPreviewProgress = function(edge, progre
         this.applyToolAppBackWindowFollow(edge, dragPx);
       }
     } catch(eFollow) {}
+
+    try {
+      var nowLog = Date.now();
+      if (!this.state._lastBackPreviewLog || nowLog - this.state._lastBackPreviewLog > 300) {
+        safeLog(this.L, 'd',
+          'back preview progress edge=' + String(edge) +
+          ' p=' + String(p) +
+          ' dragPx=' + String(dragPx) +
+          ' previewReady=' + String(previewReady)
+        );
+        this.state._lastBackPreviewLog = nowLog;
+      }
+    } catch(eLog) {}
+
     if (body) {
       var bodyMove = dir * w * eased * 0.42;
       try {
@@ -855,6 +882,7 @@ FloatBallAppWM.prototype.applyToolAppBackPreviewProgress = function(edge, progre
           bodyMove = dir * Math.min(rawDrag, Math.floor(w * 0.45));
         }
       } catch(eBodyMove) {}
+      try { body.animate().cancel(); } catch(eCancelBody) {}
       body.setTranslationX(bodyMove);
       body.setAlpha(1.0 - 0.10 * eased);
       var s = 1.0 - 0.015 * eased;
diff --git a/manifest.json b/manifest.json
index cab6f35..a752e55 100644
--- a/manifest.json
+++ b/manifest.json
@@ -58,8 +58,8 @@
       "size": 304993
     },
     "th_15_extra.js": {
-      "sha256": "019fe7752d33d65771ec9421c8760d8b907cf95cc6493a4c7379c35fc6336350",
-      "size": 109063
+      "sha256": "b955573f6715af3da1ffe2302fdc5ebd54967a067f0e8a7503d1eebfbf4e1106",
+      "size": 109900
     },
     "th_16_entry.js": {
       "sha256": "6c59d9891cd010647f84c3db93f1cf95c7bbfb758470ea21044bf72eb8ff73d1",
@@ -68,5 +68,5 @@
   },
   "keyId": "toolhub-targets-2026-rsa3072",
   "schema": 2,
-  "version": 20260521221432
+  "version": 20260521222249
 }
diff --git a/manifest.sig b/manifest.sig
index 9484c56..69011e3 100644
--- a/manifest.sig
+++ b/manifest.sig
@@ -1 +1 @@
-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