Correct alarm data findings from byte tests

The alarm station byte is shared and follows the current radio station, so
remove the per-alarm control. Remove the FM sound option, as writing it just
turns on the radio mode. Record how the MCU treats each DP127 byte.

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

alarm_block.yaml

@@ -124,7 +124,6 @@ select:
       - "Sound 5"
       - "Sound 6"
       - "Sound 7"
-      - "FM Radio"
     update_interval: 2s
     web_server:
       sorting_group_id: group_alarm_${n}
@@ -133,7 +132,6 @@ select:
       if (!id(alarm_raw_valid)) return {};
       uint8_t s = id(alarm_raw)[${o} + 6];
       if (s == 0) return std::string("Off");
-      if (s == 8) return std::string("FM Radio");
       if (s >= 1 && s <= 7) return std::string("Sound ") + std::to_string(s);
       return {};
     set_action:
@@ -147,7 +145,6 @@ select:
           else if (x == "Sound 5") value = 5;
           else if (x == "Sound 6") value = 6;
           else if (x == "Sound 7") value = 7;
-          else if (x == "FM Radio") value = 8;
           id(alarm_raw)[${o} + 6] = value;
       - script.execute: send_alarm_settings
 
@@ -174,7 +171,8 @@ number:
   - platform: template
     id: alarm_${n}_wake_brightness
     name: "Alarm ${n} Wake Light"
-    min_value: 1
+    # Reads 0 in modes without light, where the MCU ignores changes.
+    min_value: 0
     max_value: 20
     step: 1
     update_interval: 2s
@@ -211,24 +209,6 @@ number:
           id(alarm_raw)[${o} + 4] = static_cast<uint8_t>(x);
       - script.execute: send_alarm_settings
 
-  - platform: template
-    id: alarm_${n}_radio_station
-    name: "Alarm ${n} Radio Station"
-    min_value: 1
-    max_value: 60
-    step: 1
-    update_interval: 2s
-    web_server:
-      sorting_group_id: group_alarm_${n}
-      sorting_weight: 9
-    lambda: |-
-      if (!id(alarm_raw_valid)) return {};
-      return static_cast<float>(id(alarm_raw)[${o} + 8]);
-    set_action:
-      - lambda: |-
-          if (!id(alarm_raw_valid)) return;
-          id(alarm_raw)[${o} + 8] = static_cast<uint8_t>(x);
-      - script.execute: send_alarm_settings
 
   - platform: template
     id: alarm_${n}_sunrise_duration