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/RDEPUBBackgroundPriorityPolicy.swift

@@ -93,10 +93,6 @@ final class RDEPUBBackgroundPriorityManager {
         currentGeneration += 1
         coldCursor = 0 
 
-        RDEPUBBackgroundTrace.log(
-            "PriorityManager",
-            "addWarmAnchor spine=\(spineIndex) generation=\(currentGeneration) anchors=\(warmAnchors.count)"
-        )
     }
 
     func makeMetadataPriorityOrder(