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/RDEPUBJumpSession.swift

@@ -121,10 +121,6 @@ final class RDEPUBJumpSessionManager {
         lastPageDirection = nil
         lastActivityTime = now
 
-        RDEPUBBackgroundTrace.log(
-            "JumpSession",
-            "created anchor=\(anchorSpineIndex) protected=\(protectedIndices.count) seq=\(nextSequenceNumber)"
-        )
 
         return session
     }
@@ -163,20 +159,12 @@ final class RDEPUBJumpSessionManager {
 
         if now >= session.expiresAt {
             if isIdle || (now - lastActivityTime) >= policy.idleGracePeriod {
-                RDEPUBBackgroundTrace.log(
-                    "JumpSession",
-                    "end: timeout seq=\(session.sequenceNumber)"
-                )
                 return .timeout
             }
         }
 
         if !session.protectedSpineIndices.contains(currentSpineIndex) {
             if consecutivePageCount >= policy.exitPageThreshold {
-                RDEPUBBackgroundTrace.log(
-                    "JumpSession",
-                    "end: navigated-away seq=\(session.sequenceNumber) pages=\(consecutivePageCount)"
-                )
                 return .navigatedAway
             }
         } else {
@@ -189,10 +177,6 @@ final class RDEPUBJumpSessionManager {
 
     func endSession(_ reason: RDEPUBJumpSession.EndReason) {
         guard let session = activeSession else { return }
-        RDEPUBBackgroundTrace.log(
-            "JumpSession",
-            "ended seq=\(session.sequenceNumber) reason=\(reason)"
-        )
         activeSession = nil
         consecutivePageCount = 0
         lastPageDirection = nil