Fix blank track list and Recenter button bleed-through in Saved Tracks

- SavedTracksFragment was missing adapter.submitList(tracks) after the
  collect block rewrite — tracks loaded fine (16 found via SAF) but the
  RecyclerView adapter never received them, leaving the list visually blank
- showOverlay() now also hides fabRecenter; it was not in the hide list so
  the map's Recenter button remained visible on top of the fragment overlay

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

2 files changed, 4 insertions, 0 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
index 8e4a2e1..a4453be 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
@@ -429,6 +429,7 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
         fragmentContainer.visibility = View.VISIBLE
         fabRecordTrack.visibility = View.GONE
         fabLayers.visibility = View.GONE
+        fabRecenter.visibility = View.GONE
         supportFragmentManager.beginTransaction()
             .replace(R.id.fragment_container, fragment)
             .commit()
@@ -438,6 +439,8 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
         fragmentContainer.visibility = View.GONE
         fabRecordTrack.visibility = View.VISIBLE
         fabLayers.visibility = View.VISIBLE
+        // fabRecenter visibility is managed by the isFollowing observer; just restore alpha
+        fabRecenter.alpha = 1f
         // Re-apply cached conditions in case they arrived while the overlay was covering the sheet
         lastConditions?.let { applyConditions(it) }
     }
diff --git a/android-app/app/src/main/kotlin/org/terst/nav/track/SavedTracksFragment.kt b/android-app/app/src/main/kotlin/org/terst/nav/track/SavedTracksFragment.kt
index bef9df3..d8b9858 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/track/SavedTracksFragment.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/track/SavedTracksFragment.kt
@@ -54,6 +54,7 @@ class SavedTracksFragment : Fragment() {
 
         viewLifecycleOwner.lifecycleScope.launch {
             viewModel.savedTracks.collect { tracks ->
+                adapter.submitList(tracks)
                 val empty = tracks.isEmpty()
                 layoutEmpty.visibility = if (empty) View.VISIBLE else View.GONE
                 rv.visibility          = if (empty) View.GONE  else View.VISIBLE