fix(editor): prevent double scrollbars in biography tab

scss/components/actor/_biography.scss

@@ -8,4 +8,44 @@
   display: grid;
   grid-template-columns: 1fr 3fr;
   column-gap: 1em;
+  height: 100%;
+}
+
+.ds4-biography {
+  height: 100%;
+  overflow: hidden;
+
+  prose-mirror {
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+
+    // Edit mode with editor container
+    &.active {
+      .editor-container {
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+        overflow: hidden;
+
+        .editor-content {
+          flex: 1;
+          overflow-y: auto;
+          min-height: 0;
+        }
+      }
+    }
+
+    // View mode - direct editor-content
+    &.inactive {
+      .editor-content {
+        position: relative;
+        flex: 1;
+        overflow-y: auto;
+        min-height: 0;
+        inset: auto;
+      }
+    }
+  }
 }

scss/components/shared/_editor.scss

@@ -14,5 +14,41 @@
         background: transparent;
       }
     }
+
+    prose-mirror {
+      height: 100%;
+      display: flex;
+      flex-direction: column;
+      overflow: hidden;
+
+      // Edit mode with editor container
+      &.active {
+        .editor-container {
+          flex: 1;
+          display: flex;
+          flex-direction: column;
+          overflow: hidden;
+
+          .editor-content {
+            flex: 1;
+            overflow-y: auto;
+            min-height: 0;
+          }
+        }
+      }
+
+      // View mode - direct editor-content
+      &.inactive {
+        .editor-content {
+          position: relative;
+          flex: 1;
+          overflow-y: auto;
+          min-height: 0;
+          inset: auto;
+        }
+      }
+    }
   }
+
+
 }

scss/components/shared/_sheet_body.scss

@@ -7,4 +7,9 @@
 .ds4-sheet-body {
   height: 100%;
   overflow-y: auto;
+
+  // Prevent double scrollbars on biography tab
+  .ds4-sheet-tab.tab.biography.active {
+    overflow: hidden;
+  }
 }