v1.0.27: knot-inspired icon, fix media-not-found on photo open

Icon: two thick tube-style arcs with 3D glossy highlights.
  Arc 1 (left side): coral #E8665A to orange #E8A040
  Arc 2 (right side): steel blue #4A7FD4 to deep purple #7B5EA7
  Arrowheads: orange and purple. Background: dark purple-black.
  Inspired by the braided knot color palette.

Fix "media not found" when opening photos:
  - Intent now sets ClipData alongside FLAG_GRANT_READ_URI_PERMISSION
    so the permission correctly propagates through the system chooser
    to whichever app the user picks.
  - openFile() and downloadToCache() both call MediaScannerConnection
    so newly synced/downloaded files appear in gallery MediaStore index
    before the viewer launches.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/ui/files/FilesViewModel.kt

@@ -1,6 +1,7 @@
 package com.syncflow.ui.files
 
 import android.content.Context
+import android.media.MediaScannerConnection
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.syncflow.data.db.SyncFileStateDao
@@ -71,6 +72,8 @@ class FilesViewModel @Inject constructor(
     fun openFile(file: SyncFileStateEntity) {
         val resolved = resolveFile(file, emitErrorIfMissing = false)
         if (resolved != null) {
+            // Ensure MediaStore knows about this file so gallery apps can open it
+            MediaScannerConnection.scanFile(context, arrayOf(resolved.absolutePath), null, null)
             viewModelScope.launch { _fileAction.emit(FileAction.Open(resolved)) }
         } else {
             downloadAndOpen(file)
@@ -192,6 +195,7 @@ class FilesViewModel @Inject constructor(
             cacheFile.outputStream().use { out ->
                 provider.downloadFile("${pair.remotePath}/${file.relativePath}", out) { }.getOrThrow()
             }
+            MediaScannerConnection.scanFile(context, arrayOf(cacheFile.absolutePath), null, null)
             cacheFile
         } catch (e: Exception) {
             Timber.e(e, "Download for preview failed: ${file.relativePath}")