fix: Store context at module level in gestures.ts

Fix bug where context parameter was unused in init() but referenced
throughout the file. Now properly stored as module-level variable
so all gesture handler functions can access it.

web/src/reader/features/gestures.ts

@@ -4,8 +4,10 @@ import type { ReaderContext } from "../core/reader-context";
 
 let currentPanelIndex = 0;
 let currentPagePanels: Panel[] = [];
+let context: ReaderContext;
 
-export async function init(context: ReaderContext): Promise<void> {
+export async function init(readerContext: ReaderContext): Promise<void> {
+  context = readerContext;
   setupGestures();
   await loadPanelsIfComic();
 }