feat: NIP-53 full compliance - render all live activity kinds

- Add case-insensitive role matching in ParticipantTag (accepts both
  "host" and "Host" from other clients per NIP-53 spec)
- Add PARTICIPANT role to ROLE enum per NIP-53 spec
- Add MeetingSpaceEvent (30312), MeetingRoomEvent (30313), and
  MeetingRoomPresenceEvent (10312) consumption in LocalCache
- Create rendering composables for MeetingSpaceEvent and MeetingRoomEvent
  with status flags (OPEN/PRIVATE/CLOSED for spaces, LIVE/PLANNED/ENDED
  for rooms) and participant display
- Add meeting kinds to all discovery feed relay filters (global, authors,
  hashtag, geohash, community)
- Add meeting kinds to ChannelCardCompose and LiveActivityCard thumb
  rendering
- Add meeting kinds to KindRegistry search aliases

https://claude.ai/code/session_01CJ6xfY9gRA1c5r4T1SrUuv

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/ParticipantTag.kt

@@ -37,6 +37,7 @@ enum class ROLE(
     HOST("host"),
     MODERATOR("moderator"),
     SPEAKER("speaker"),
+    PARTICIPANT("participant"),
 }
 
 @Immutable
@@ -58,7 +59,7 @@ data class ParticipantTag(
             ensure(tag.has(3)) { return false }
             ensure(tag[0] == TAG_NAME) { return false }
             ensure(tag[1].length == 64) { return false }
-            ensure(tag[3] == ROLE.HOST.code) { return false }
+            ensure(tag[3].equals(ROLE.HOST.code, ignoreCase = true)) { return false }
             return true
         }
 
@@ -76,7 +77,7 @@ data class ParticipantTag(
             ensure(tag.has(3)) { return null }
             ensure(tag[0] == TAG_NAME) { return null }
             ensure(tag[1].length == 64) { return null }
-            ensure(tag[3] == ROLE.HOST.code) { return null }
+            ensure(tag[3].equals(ROLE.HOST.code, ignoreCase = true)) { return null }
 
             val hint = RelayUrlNormalizer.normalizeOrNull(tag[2])