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/RDEPUBReaderRuntime.swift

@@ -430,11 +430,6 @@ final class RDEPUBReaderRuntime {
         }
         let previewLocation = locationCoordinator.currentVisibleLocation() ?? context.persistenceLocation()
 
-        RDEPUBBackgroundTrace.log(
-            "Runtime",
-            "repaginateCurrentChapterOnly spine=\(currentSpineIndex) generation=\(previewGeneration)"
-        )
-
         chapterLoader.loadChapter(
             spineIndex: currentSpineIndex,
             store: chapterRuntimeStore,
@@ -468,10 +463,7 @@ final class RDEPUBReaderRuntime {
                 readerView.transitionToPage(pageNum: 0, animated: false)
 
             case .failure(let error):
-                RDEPUBBackgroundTrace.log(
-                    "Runtime",
-                    "repaginateCurrentChapterOnly FAILED spine=\(currentSpineIndex) generation=\(previewGeneration) error=\(error)"
-                )
+                break
             }
         }
     }
@@ -523,7 +515,6 @@ final class RDEPUBReaderRuntime {
 
         if needsFullRepaginationAfterSettingsClose {
             needsFullRepaginationAfterSettingsClose = false
-            RDEPUBBackgroundTrace.log("Runtime", "settingsPanelDidDisappear: triggering full repagination")
             paginationCoordinator.repaginatePreservingCurrentLocation()
         }
     }