feat: add setting to control auto-scroll to reading position

- Added autoScrollToReadingPosition setting (enabled by default)
- Users can now disable auto-scroll while keeping position sync enabled
- Setting appears in Layout & Behavior section of settings
- Auto-scroll only happens when both syncReadingPosition and
  autoScrollToReadingPosition are enabled

src/components/ContentPanel.tsx

@@ -275,6 +275,9 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
     if (settings?.syncReadingPosition === false) {
       return
     }
+    if (settings?.autoScrollToReadingPosition === false) {
+      return
+    }
     if (!isTrackingEnabled) {
       return
     }
@@ -324,7 +327,7 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
         behavior: 'smooth'
       })
     }, 500) // Give content time to render
-  }, [isTextContent, activeAccount, articleIdentifier, settings?.syncReadingPosition, selectedUrl, isTrackingEnabled, restoreKey])
+  }, [isTextContent, activeAccount, articleIdentifier, settings?.syncReadingPosition, settings?.autoScrollToReadingPosition, selectedUrl, isTrackingEnabled, restoreKey])
 
   // Note: We intentionally do NOT save on unmount because:
   // 1. Browser may scroll to top during back navigation, causing 0% saves

src/components/Settings.tsx

@@ -44,6 +44,7 @@ const DEFAULT_SETTINGS: UserSettings = {
   fullWidthImages: true,
   renderVideoLinksAsEmbeds: true,
   syncReadingPosition: true,
+  autoScrollToReadingPosition: true,
   autoMarkAsReadOnCompletion: false,
   hideBookmarksWithoutCreationDate: true,
   ttsUseSystemLanguage: false,

src/components/Settings/LayoutBehaviorSettings.tsx

@@ -118,6 +118,19 @@ const LayoutBehaviorSettings: React.FC<LayoutBehaviorSettingsProps> = ({ setting
         </label>
       </div>
 
+      <div className="setting-group">
+        <label htmlFor="autoScrollToReadingPosition" className="checkbox-label">
+          <input
+            id="autoScrollToReadingPosition"
+            type="checkbox"
+            checked={settings.autoScrollToReadingPosition !== false}
+            onChange={(e) => onUpdate({ autoScrollToReadingPosition: e.target.checked })}
+            className="setting-checkbox"
+          />
+          <span>Auto-scroll to saved reading position</span>
+        </label>
+      </div>
+
       <div className="setting-group">
         <label htmlFor="autoMarkAsReadOnCompletion" className="checkbox-label">
           <input