chore: add diagnostic logging for pre-roll bumpers (v1.0.0.6)

Helps diagnose why a Trailer Pre-Roll/Feature Pre-Roll bumper isn't
playing by logging invalid library IDs, empty library results, and
the movie picked.

build.yaml

@@ -1,5 +1,5 @@
 ---
-version: 1.0.0.5
+version: 1.0.0.6
 name: CinemaTrailers4Jellyfins
 guid: b581493e-1046-40ed-b6dc-cb8027624984
 description: >
@@ -12,10 +12,10 @@ category: General
 owner: 514mart
 targetAbi: 10.11.0.0
 changelog:
-  - Add Trailer Pre-Roll and Feature Pre-Roll bumpers via IIntroProvider — pick
-    existing Jellyfin Movie libraries in settings and a random movie from each is
-    played before the trailer block ("Now Playing") and/or right before the
-    feature ("Feature Presentation"); both are independent and disabled by default
+  - Add diagnostic logging for Trailer Pre-Roll and Feature Pre-Roll bumpers —
+    logs a warning if the configured library ID is invalid, and a debug message
+    when no eligible movie is found or which movie was picked, to help
+    troubleshoot why a bumper isn't playing
 
 dotnetProjects:
   - name: Jellyfin.Plugin.CinemaTrailers4Jellyfins