Gallery: fix sync dot colors — match phone photos against NAS directory

Phase 1 was only checking the Kisani manifest for sync status. Phone photos
uploaded by other tools had no manifest entry, showed as orange (phone-only)
even though they were already on the NAS.

Now Phase 1 falls back to a filename lookup against the full NAS directory
listing: manifest match → green (.synced), NAS directory match → green (.synced),
no match → orange (.phone). Phase 3 skips filenames already resolved in Phase 1.

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

Features/Browse/GalleryViewModel.swift

@@ -175,22 +175,31 @@ final class GalleryViewModel: ObservableObject {
     ) -> [GalleryItem] {
         var byID   = [String: ManifestEntry](minimumCapacity: manifest.count)
         var byName = [String: ManifestEntry](minimumCapacity: manifest.count)
-        var manifestFilenames = Set<String>(minimumCapacity: manifest.count)
+        // allNASFilenames tracks every filename already represented so Phase 3 skips duplicates
+        var allNASFilenames = Set<String>(minimumCapacity: manifest.count + nasDirectory.count)
         for entry in manifest {
             if !entry.localIdentifier.isEmpty { byID[entry.localIdentifier] = entry }
             let key = entry.filename.lowercased()
             if byName[key] == nil { byName[key] = entry }
-            manifestFilenames.insert(key)
+            allNASFilenames.insert(key)
+        }
+        // Build NAS directory lookup for filename-based sync matching in Phase 1
+        var nasByName = [String: NASItem](minimumCapacity: nasDirectory.count)
+        for item in nasDirectory {
+            let lower = item.name.lowercased()
+            if nasByName[lower] == nil { nasByName[lower] = item }
         }
 
         var result: [GalleryItem] = []
         result.reserveCapacity(phone.count + manifest.count + nasDirectory.count / 4)
         var coveredFilenames = Set<String>()
 
-        // Phase 1: Phone assets — matched to manifest = synced, otherwise phone-only
+        // Phase 1: Phone assets
+        // Priority: manifest match (Kisani upload) → NAS directory match (other tool) → phone-only
         for (localID, filename, date, duration, isVideo) in phone {
             let key = filename.lowercased()
             if let entry = byID[localID] ?? byName[key] {
+                // Kisani manifest match → green dot (.synced)
                 coveredFilenames.insert(entry.filename.lowercased())
                 result.append(GalleryItem(
                     id: "synced_\(localID)",
@@ -201,7 +210,20 @@ final class GalleryViewModel: ObservableObject {
                     mediaType: isVideo ? .video : .photo,
                     source: .synced(localIdentifier: localID, nasPath: entry.remotePath)
                 ))
+            } else if let nasItem = nasByName[key] {
+                // Filename match in NAS directory (uploaded by other tool) → green dot (.synced)
+                allNASFilenames.insert(key) // mark covered so Phase 3 skips it
+                result.append(GalleryItem(
+                    id: "synced_\(localID)",
+                    filename: filename,
+                    creationDate: date,
+                    duration: duration,
+                    fileSize: nasItem.size > 0 ? nasItem.size : nil,
+                    mediaType: isVideo ? .video : .photo,
+                    source: .synced(localIdentifier: localID, nasPath: nasItem.path)
+                ))
             } else {
+                // Not on NAS → orange dot (.phone)
                 result.append(GalleryItem(
                     id: "phone_\(localID)",
                     filename: filename,
@@ -231,14 +253,15 @@ final class GalleryViewModel: ObservableObject {
             ))
         }
 
-        // Phase 3: NAS directory items not tracked by the manifest (uploaded by other tools)
+        // Phase 3: NAS directory items not already shown (uploaded by other tools, not on phone)
         for item in nasDirectory {
             let lower = item.name.lowercased()
-            guard !manifestFilenames.contains(lower) else { continue }
+            guard !allNASFilenames.contains(lower) else { continue }
             let ext = (item.name as NSString).pathExtension.lowercased()
             let mediaType: GalleryItem.MediaType =
                 videoExts.contains(ext) ? .video : imageExts.contains(ext) ? .photo : .unknown
             guard mediaType != .unknown else { continue }
+            allNASFilenames.insert(lower)
             result.append(GalleryItem(
                 id: "nas_dir_\(item.path)",
                 filename: item.name,