Minamp 1.2

- Transcoding: send client identities Plex has a profile for (unknown ones get
  400 "unable to find a matching profile"), with a fresh session id per variant
- Stream proxy: fetch transcodes once into a temp file and serve every player
  request from it, so reconnects no longer restart the transcode (503s, tracks
  cut short); original files still pass Range requests through
- Sign-in: remember the pending link code so it survives Minamp being closed
  while the code is entered elsewhere; add "I've entered it - check now"
- Diagnostics: in-app connection log (DiagLog) with a streaming test and save
  to SD card; tokens are never logged

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

src/com/minamp/net/Http.java

@@ -283,7 +283,20 @@ public final class Http {
 
     public static Response request(String method, String url, Map<String, String> headers, byte[] body, int timeoutMs) throws IOException {
         for (int redirects = 0; ; redirects++) {
-            Response r = requestOnce(method, url, headers, body, timeoutMs);
+            long t0 = System.currentTimeMillis();
+            Response r;
+            try {
+                r = requestOnce(method, url, headers, body, timeoutMs);
+            } catch (IOException e) {
+                DiagLog.log(method + " " + DiagLog.redact(url) + " -> FAILED after " + (System.currentTimeMillis() - t0) + "ms: " + Threads.describe(e));
+                throw e;
+            } catch (RuntimeException e) {
+                DiagLog.log(method + " " + DiagLog.redact(url) + " -> FAILED: " + Threads.describe(e));
+                throw e;
+            }
+            if (!url.contains("/photo/:/transcode")) { // artwork would drown out everything else
+                DiagLog.log(method + " " + DiagLog.redact(url) + " -> " + r.code + " (" + (System.currentTimeMillis() - t0) + "ms)");
+            }
             if ((r.code == 301 || r.code == 302 || r.code == 307 || r.code == 308) && redirects < 4
                     && ("GET".equals(method) || "HEAD".equals(method))) {
                 String loc = r.header("location");