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/RDURLReaderController.swift

@@ -214,9 +214,7 @@ public final class RDURLReaderController: UIViewController {
             ?? readerController.textBook?.pages.count
             ?? readerController.activePages.count
         let numPages = readerController.readerView.numberOfPages()
-        print("[ReadViewDemo] performDemoPageNavigation(\(pageNumber)): knownPages=\(knownPages), readerView.numberOfPages=\(numPages), currentPage=\(readerController.readerView.currentPage)")
         let moved = readerController.go(toPageNumber: pageNumber, animated: animated)
-        print("[ReadViewDemo] performDemoPageNavigation(\(pageNumber)): moved=\(moved), after currentPage=\(readerController.readerView.currentPage)")
         if moved {
             emitDemoState(prefix: "page=\(pageNumber)")
         }
@@ -264,7 +262,6 @@ public final class RDURLReaderController: UIViewController {
         if pendingDemoPageRequest.attemptCount >= maxPendingDemoPageAttempts {
             self.pendingDemoPageRequest = nil
             isRetryingPendingDemoPage = false
-            print("[ReadViewDemo] automation page=\(pendingDemoPageRequest.pageNumber) failed after \(pendingDemoPageRequest.attemptCount) attempts")
             return
         }
 
@@ -280,7 +277,6 @@ public final class RDURLReaderController: UIViewController {
         let href = location?.href ?? "nil"
         let progression = location.map { String(format: "%.4f", $0.navigationProgression) } ?? "nil"
         let page = readerController.currentPageNumber.map(String.init) ?? "nil"
-        print("[ReadViewDemo] automation \(prefix) -> page \(page) href \(href) progression \(progression)")
     }
 
     private func installDemoStateLabel() {
@@ -370,7 +366,6 @@ public final class RDURLReaderController: UIViewController {
         if let logPrefix {
             logDemoState(prefix: logPrefix)
         } else if logIfChanged, state != lastEmittedDemoState {
-            print("[ReadViewDemo] automation \(state)")
         }
         lastEmittedDemoState = state
     }