feat: update progress indicator to use dynamic page calculation

- Import getCurrentPageFromScroll for viewport-based page calculation
- Replace spine index with actual calculated page numbers when available
- Fix bug where currentPage was assigned to itself (no-op)
- Add fallback to estimated pages while calculation is in progress

web/src/reader/features/progress-indicator.ts

@@ -1,4 +1,5 @@
 import type { ReaderContext } from "../core/reader-context";
+import { getCurrentPageFromScroll } from "../ebook/page-calculator";
 interface ProgressDisplay {
   mode: "pages" | "chapter" | "percentage" | "time-left";
   text: string;
@@ -111,14 +112,27 @@ function updateProgressDisplay(context: ReaderContext): void {
   let currentPage = 0;
   let totalPages = 0;
   if (state.currentReader.type === "ebook") {
-    currentPage = state.currentReader.currentSpineIndex + 1;
-    totalPages = state.currentReader.cif.spine.length;
-  } else if (state.currentReader.type === "pdf") {
-    currentPage = state.currentReader.currentPage;
-    totalPages = state.readerMetadata?.total_pages || 0;
-  } else {
-    currentPage = state.currentReader.currentPage;
-    totalPages = state.currentReader.images.length;
+    const reader = state.currentReader as any;
+    const pageInfo = reader.pageCalculationResult;
+
+    if (pageInfo && pageInfo.totalPages > 0) {
+      const container = document.getElementById("reader-content");
+      const viewportHeight = window.innerHeight;
+      currentPage = getCurrentPageFromScroll(
+        pageInfo,
+        reader.currentSpineIndex,
+        container?.scrollTop || 0,
+        viewportHeight,
+      );
+      totalPages = pageInfo.totalPages;
+    } else {
+      // Fallback to estimated pages while calculating
+      currentPage = reader.currentSpineIndex + 1;
+      totalPages =
+        state.readerMetadata?.total_pages ||
+        state.currentReader.cif.locations?.estimatedPages ||
+        state.currentReader.cif.spine.length;
+    }
   }
   getReadingSpeed().then((speed) => {
     const result = calculateProgress(