fix: reset totalPages to 0 on volume change to prevent stale totalPages capping target page number

webapp/tipitaka-web/src/stores/appStore.ts

@@ -30,7 +30,7 @@ export const useReaderStore = create<ReaderState>((set) => ({
   volumeTitle: '',
   highlightQuery: '',
 
-  setVolume: (vol) => set({ currentVolume: vol, currentPage: 1 }),
+  setVolume: (vol) => set({ currentVolume: vol, currentPage: 1, totalPages: 0 }),
   setPage: (page) => set((s) => ({ currentPage: Math.max(1, Math.min(page, s.totalPages || 9999)) })),
   setCurrentContent: (content) => set({ currentContent: content }),
   setTotalPages: (total) => set({ totalPages: total }),