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>

res/layout/activity_setup.xml

@@ -30,6 +30,12 @@
             <Button android:id="@+id/btn_manual" style="@style/ButtonOutline"
                 android:layout_width="match_parent" android:layout_marginTop="10dp"
                 android:text="Connect to a server address" />
+            <TextView android:id="@+id/btn_setup_log"
+                android:layout_width="wrap_content" android:layout_height="wrap_content"
+                android:layout_marginTop="18dp" android:padding="8dp"
+                android:background="@drawable/bg_pressable"
+                android:textColor="@color/text2" android:textSize="12sp"
+                android:text="Connection log" />
         </LinearLayout>
 
         <!-- PIN -->
@@ -40,7 +46,7 @@
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:gravity="center" android:textColor="@color/text2" android:textSize="13sp"
                 android:paddingTop="12dp"
-                android:text="On a computer or another phone, open" />
+                android:text="On a computer or a newer phone, open" />
             <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
                 android:text="plex.tv/link" android:textSize="22sp" android:textStyle="bold"
                 android:textColor="@color/accent" android:paddingTop="4dp" />
@@ -60,8 +66,11 @@
                     android:textColor="@color/text2" android:textSize="12sp" android:paddingLeft="8dp"
                     android:text="Waiting for you to link…" />
             </LinearLayout>
+            <Button android:id="@+id/btn_pin_check" style="@style/ButtonAccent"
+                android:layout_width="match_parent" android:layout_marginTop="20dp"
+                android:text="I've entered it \u2014 check now" />
             <Button android:id="@+id/btn_pin_cancel" style="@style/ButtonOutline"
-                android:layout_width="match_parent" android:layout_marginTop="24dp"
+                android:layout_width="match_parent" android:layout_marginTop="10dp"
                 android:text="Cancel" />
         </LinearLayout>