fix(addons): bring silverlabs packs into schema compliance

- recipes: add unlock { context: always_unlocked } to all spark_pet and lobby_transfer recipes (1.20+ requirement) — fixes mc-lobby crash loop
- spark_dragon entity_sensor: wrap in subsensors[] and convert sensor_range → range [a,b] per 1.21 schema
- anthrax_cat interact: wrap event/filters in on_interact to match Bedrock 1.21 interact schema
- block format_version: bump mailbox and smart_crafting_table to 1.21.60
- item icons: replace { texture: X } with shorthand string form
- heyhe_egg description: replace bare category with menu_category block

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

addon/anthrax_cat_BP/entities/anthrax_cat.json

@@ -12,9 +12,13 @@
         "minecraft:interact": {
           "interactions": [
             {
+              "on_interact": {
+                "filters": { "test": "is_family", "subject": "other", "value": "player" },
+                "event": "silverlabs:interacted",
+                "target": "self"
+              },
               "interact_text": "action.interact.fortune",
-              "play_sounds": "note.bell",
-              "event": "silverlabs:interacted"
+              "play_sounds": "note.bell"
             }
           ]
         }