Fix cold-start play_media failure and swap reversed room IDs

The Spotify integration only exposes the media_player.play_media
service once it has an active playback context, which doesn't exist
yet on a cold start; the fixed 2s delay after select_source wasn't
long enough in that case even though it always worked once something
had already played. Poll supported_features for the PLAY_MEDIA bit
(up to 8s) before calling play_media instead of guessing a fixed delay.

Also swap the Living Room/Bedroom source_list ID mapping in both the
prompt (for display) and the functions (for select_source) -- it was
backwards.

Adds a test-harness regression case exercising the opaque Spotify
Connect device IDs the source_list actually reports.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

current-functions.txt

@@ -94,8 +94,16 @@
         target:
           entity_id: media_player.spotify_bhetherman
         data:
-          source: "{{ room }}"
-      - delay: "00:00:02"
+          source: "{{ room | replace('Living Room', 'd0166d6f83796b0f9059b0adf0f6cb0d81fa6376') | replace('Bedroom', 'a334c8ba989367b52303eaa9dbc424cdd83012b5') }}"
+      - repeat:
+          while:
+            - condition: template
+              value_template: >-
+                {{ repeat.index <= 8 and
+                   (state_attr('media_player.spotify_bhetherman', 'supported_features') | int(0)
+                    | bitwise_and(512)) != 512 }}
+          sequence:
+            - delay: "00:00:01"
       - service: media_player.play_media
         target:
           entity_id: media_player.spotify_bhetherman
@@ -137,8 +145,16 @@
         target:
           entity_id: media_player.spotify_bhetherman
         data:
-          source: "{{ room }}"
-      - delay: "00:00:02"
+          source: "{{ room | replace('Living Room', 'd0166d6f83796b0f9059b0adf0f6cb0d81fa6376') | replace('Bedroom', 'a334c8ba989367b52303eaa9dbc424cdd83012b5') }}"
+      - repeat:
+          while:
+            - condition: template
+              value_template: >-
+                {{ repeat.index <= 8 and
+                   (state_attr('media_player.spotify_bhetherman', 'supported_features') | int(0)
+                    | bitwise_and(512)) != 512 }}
+          sequence:
+            - delay: "00:00:01"
       - service: media_player.play_media
         target:
           entity_id: media_player.spotify_bhetherman