Fix PDF zoom in scroll and paginated mode

- Remove max-width:100% from .pdf-page so canvas can exceed container width
- Override max-width:65ch on .pdf-page-wrapper (inherited from reader-content > *)
- Apply pdfZoom factor in pdfSmartZoomPage so paginated mode respects the zoom slider

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

static/css/app.css

@@ -1501,11 +1501,11 @@ body.dnd-mode .timer-display {
   margin: 0 auto 1rem;
   display: flex;
   justify-content: center;
+  max-width: none;
 }
 
 .pdf-page {
   display: block;
-  max-width: 100%;
   box-shadow: 0 2px 8px rgba(0,0,0,0.25);
 }
 
@@ -1628,6 +1628,7 @@ body.dnd-mode .timer-display {
 .reader-theme-sepia .reader-content  { background:#f5e6c8; color:#3b2a1a; }
 .reader-theme-bright .reader-content { background:#fff; color:#111; }
 .reader-content > * { max-width:var(--reader-max-width,65ch); margin-left:auto; margin-right:auto; }
+.reader-content > .pdf-page-wrapper { max-width: none; margin: 0 auto 1rem; }
 
 /* Inline panels */
 .reader-settings-panel, .reader-search-bar {

static/js/app.js

@@ -3549,7 +3549,7 @@ async function pdfSmartZoomPage(pageNum) {
   const scale = Math.min(
     (containerW - pad * 2) / contentW,
     (containerH - pad * 2) / contentH
-  );
+  ) * (readerSettings.pdfZoom / 100);
 
   // Re-render canvas at new scale if significantly different
   const currentScale = canvas.width / naturalVp.width;