feat: add screen recordings filter, exclude by default

Screen recordings are videos captured by iOS screen recording and are
almost never wanted in a photo backup. They are now excluded from all
counts and backup queues unless explicitly enabled.

Changes:
- BackupFilter.includeScreenRecordings (default: false) added
- PHAssetMediaSubtype.videoScreenRecording predicate applied in both
  fetchAssets() and fetchResultForReconciliation() — excluded at the
  PHFetchRequest level before enumeration
- LocalPhotoIndex.Record.isScreenRecording populated via makeRecord()
  so the fast-path countSafe/count also respects the toggle
- LocalPhotoIndex.passes() checks includeScreenRecordings
- Settings "Screen Recordings" toggle added below Screenshots

This also resolves the transient count flash: screen recordings were
being included in the "need backup" tally on the initial fast-path
reconcile, then dropping when the filter was fully applied.

Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>

Services/PhotoLibraryService.swift

@@ -34,6 +34,12 @@ final class PhotoLibraryService: PhotoLibraryProtocol {
                 PHAssetMediaSubtype.photoScreenshot.rawValue
             ))
         }
+        if !filter.includeScreenRecordings {
+            subpredicates.append(NSPredicate(
+                format: "NOT ((mediaSubtype & %d) != 0)",
+                PHAssetMediaSubtype.videoScreenRecording.rawValue
+            ))
+        }
 
         if subpredicates.count > 1 {
             options.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: subpredicates)
@@ -46,6 +52,7 @@ final class PhotoLibraryService: PhotoLibraryProtocol {
         result.enumerateObjects { asset, _, _ in
             autoreleasepool {
                 let isScreenshot = asset.mediaSubtypes.contains(.photoScreenshot)
+                let isScreenRecording = asset.mediaSubtypes.contains(.videoScreenRecording)
                 let resources = PHAssetResource.assetResources(for: asset)
                 let isRAW = resources.contains { $0.type == .alternatePhoto }
                 if isRAW && !filter.includeRAW { return }
@@ -61,7 +68,8 @@ final class PhotoLibraryService: PhotoLibraryProtocol {
                     pixelHeight: asset.pixelHeight,
                     duration: asset.duration,
                     isScreenshot: isScreenshot,
-                    isRAW: isRAW
+                    isRAW: isRAW,
+                    isScreenRecording: isScreenRecording
                 ))
             }
         }
@@ -91,6 +99,12 @@ final class PhotoLibraryService: PhotoLibraryProtocol {
                 PHAssetMediaSubtype.photoScreenshot.rawValue
             ))
         }
+        if !filter.includeScreenRecordings {
+            subpredicates.append(NSPredicate(
+                format: "NOT ((mediaSubtype & %d) != 0)",
+                PHAssetMediaSubtype.videoScreenRecording.rawValue
+            ))
+        }
 
         if subpredicates.count > 1 {
             options.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: subpredicates)