Backport from the iOS version: never mark early endings as played, stall warning, Close

- An episode only counts as played when playback reaches the last minute.
  Saved files that "complete" early (cut-short download, SD card problems) were
  marked as played on the server, as were streams ending 30-60 s early; now a
  stream is retried and a file is reported.
- "Playing" but the position not moving for 12 s: say so.
- Menu -> "Pechar MiniABS" (Latest/Shows/Saved and the player): save the
  position, stop playback and close the app.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/com/miniabs/PlayerService.java

@@ -85,6 +85,9 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
     private long playingSince;
 
     private long lastTick;
+    private int stallPos = -1;      // position last seen moving
+    private long stallSince;
+    private boolean stallWarned;
     private float listened;        // seconds listened since the last sync
     private long lastSync;
     private volatile boolean syncing;
@@ -552,10 +555,16 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
     public void onCompletion(MediaPlayer p) {
         if (p != mp) return;
         int pos = positionMs(), dur = durationMs();
-        // Old Android's streamer "completes" when the connection drops. Treat that as an error.
-        if (!local && dur > 0 && pos < dur - 30000) {
+        // Only playback that got to (nearly) the end counts as listened; anything else is never
+        // reported as played. Old Android's streamer "completes" when the connection drops, and a
+        // saved file cut short (SD card, interrupted copy) "completes" early too.
+        if (dur > 0 && pos < dur - 60000) {
             lastPosMs = pos;
-            retryStream("Perdeuse a conexión, reconectando…");
+            if (!local && contentUrl != null) {
+                retryStream("Perdeuse a conexión, reconectando…");
+            } else {
+                fail("O ficheiro rematou antes de tempo (" + Util.clock(pos) + "). Proba a descargalo de novo.");
+            }
             return;
         }
         state = ENDED;
@@ -672,6 +681,16 @@ public class PlayerService extends Service implements MediaPlayer.OnPreparedList
             App.setProgress(ep.id, lastPosMs / 1000.0, dur, false);
             if (now - lastSync > SYNC_EVERY) syncNow(false);
             if (now - playingSince > 60000) retries = 0;
+            // "playing" but not moving for 12 s: say so instead of staying silent
+            if (lastPosMs != stallPos) {
+                stallPos = lastPosMs;
+                stallSince = now;
+                stallWarned = false;
+            } else if (!stallWarned && now - stallSince > 12000) {
+                stallWarned = true;
+                status = "A reprodución quedou parada. Proba a pausar e reproducir de novo.";
+                android.widget.Toast.makeText(this, status, android.widget.Toast.LENGTH_LONG).show();
+            }
             if (sleepAt > 0 && now >= sleepAt) {
                 sleepAt = 0;
                 pause();