Remove all RDEPUBBackgroundTrace.log and bare print diagnostic calls

Keep only the evaluateFullPageMapTakeover: fullReplace diagnostic log
in RDEPUBPageMapReconciliationCoordinator.swift for future debugging.

Simplified RDEPUBBackgroundTrace to just the log method (removed measure
and debug gating). Removed all [EPUB][...], [ReadViewDemo], and
[EPUB][Pagination] print statements across the project.

Also includes earlier bug fixes:
- Fix stale currentPageNumber in extendPartial commit
- Fix pageCurl rebindVisiblePage during transition
- Fix keepCurrentWindow not removing pending update from queue
- Fix right-aligned text (巫鸿 bug) via avoidPageBreakInside,
  tail merger, and continuation paragraph normalization
- Add text-indent reset for aligned blocks in CSS compatibility layer

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

Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBReaderAssemblyCoordinator.swift

@@ -16,9 +16,6 @@ final class RDEPUBReaderAssemblyCoordinator {
         setupLoadingIndicator(controller.loadingIndicator, in: controller.view)
         setupErrorLabel(controller.errorLabel, in: controller.view)
         controller.delegate?.epubReader(controller, configureTopToolView: controller.topToolView)
-        #if DEBUG
-        print("[ReadViewDemo] assembleInterface: pageProvider=\(readerView.pageProvider != nil ? "set" : "nil"), numberOfPages=\(readerView.numberOfPages())")
-        #endif
     }
 
     func finishExternalTextBookLaunchIfNeeded() {
@@ -35,13 +32,7 @@ final class RDEPUBReaderAssemblyCoordinator {
         }
 
         if let textBook = controller.textBook {
-            #if DEBUG
-            print("[ReadViewDemo] finishExternalTextBook: applying textBook with \(textBook.pages.count) pages")
-            #endif
             runtime.applyTextBook(textBook, restoreLocation: restoreLocation)
-            #if DEBUG
-            print("[ReadViewDemo] finishExternalTextBook: after applyTextBook, numberOfPages=\(context.readerView?.numberOfPages() ?? -1)")
-            #endif
         } else {
             runtime.finishPagination(restoreLocation: restoreLocation)
         }