feat: Story audio mute/unmute toggle — button on story overlay and 3-dot menu

feat: Multi-select in excluded chats/story users lists with batch actions
feat: Dynamic count refresh on manage list buttons
imp: Opening tweak settings pauses any playing video/audio (toggleable in advanced settings)
imp: Tweak settings quick-access (hold feed tab) now on by default
imp: Disable auto-unmuting reels now off by default
imp: Excluding a chat or story now immediately marks as seen

src/Settings/SCISettingsViewController.m

@@ -78,9 +78,17 @@ static char rowStaticRef[] = "row";
         self.navigationItem.searchController = sc;
         self.navigationItem.hidesSearchBarWhenScrolling = NO;
         self.searchController = sc;
+
+        self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
+            initWithBarButtonSystemItem:UIBarButtonSystemItemClose
+                                 target:self action:@selector(sciDismissSettings)];
     }
 }
 
+- (void)sciDismissSettings {
+    [self dismissViewControllerAnimated:YES completion:nil];
+}
+
 - (void)viewWillAppear:(BOOL)animated {
     [super viewWillAppear:animated];
     [self.tableView reloadData];