Remove text marking and PDF pagination from master (moved to testing branch)

- Remove mouseup highlight selection listener
- Remove Paginated button from PDF settings panel
- Remove pagination auto-enable on book open

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

static/js/app.js

@@ -2965,16 +2965,6 @@ async function openBook(bookId) {
     // Apply reader settings (theme, font size, etc.)
     applyReaderSettings(isPdfBook);
 
-    // Enable PDF paginated mode if configured (auto on mobile)
-    if (isPdfBook && readerSettings.pdfPaginated) {
-      enterPdfPaginatedMode();
-    }
-
-    // Wire highlight selection listener for EPUB
-    if (!isPdfBook) {
-      contentEl.addEventListener('mouseup', handleReaderSelection);
-    }
-
     // Swipe for PDF paginated
     contentEl.addEventListener('touchstart', e => { _touchStartX = e.touches[0].clientX; }, {passive: true});
     contentEl.addEventListener('touchend', e => {
@@ -3387,7 +3377,6 @@ function toggleSettingsPanel() {
     panel.innerHTML = `
       <label>Zoom <input type="range" id="rs-zoom" min="50" max="200" step="10" value="${readerSettings.pdfZoom}"> <span id="rs-zoom-val">${readerSettings.pdfZoom}%</span></label>
       <button class="btn btn-sm ${readerSettings.pdfInverted ? 'active' : ''}" id="rs-invert">Invert</button>
-      <button class="btn btn-sm ${readerSettings.pdfPaginated ? 'active' : ''}" id="rs-paginated">Paginated</button>
     `;
   }
 
@@ -3459,16 +3448,6 @@ function toggleSettingsPanel() {
       saveReaderSettings();
     });
 
-    panel.querySelector('#rs-paginated').addEventListener('click', function () {
-      readerSettings.pdfPaginated = !readerSettings.pdfPaginated;
-      this.classList.toggle('active', readerSettings.pdfPaginated);
-      saveReaderSettings();
-      if (readerSettings.pdfPaginated) {
-        enterPdfPaginatedMode();
-      } else {
-        exitPdfPaginatedMode();
-      }
-    });
   }
 }