feat: NIP-72 compliance fixes + standalone Communities screen

Quartz (NIP-72 compliance)
- Fix CommunityDefinition image() builder to use the NIP-72 ImageTag
  (was wrongly pointing at the NIP-23 ImageTag, which prevented the
  builder from attaching `<W>x<H>` dimensions).
- Fix CommunityPostApproval notifyAuthor() to emit a `p` tag for the
  post author as required by NIP-72 (was duplicating the `e` tag).
- Add RelayTag.MARKER_AUTHOR/REQUESTS/APPROVALS constants.

Amethyst - Communities screen
- New top-level Communities screen with FeedFilterSpinner TopNav that
  supports the Mine option (filters to communities authored by the
  logged-in user).
- New Route.Communities + drawer entry.
- New CommunitiesFeedFilter (subclass of DiscoverCommunityFeedFilter
  using defaultCommunitiesFollowList + Mine handling).
- New CommunitiesListFilterAssembler/SubAssembler with dedicated
  filterCommunitiesMine relay query.
- Account.liveCommunitiesFollowLists + settings.defaultCommunitiesFollowList.
- TopNavFilterState.communityRoutes (includes Mine).

Amethyst - Create Community
- Route.NewCommunity + FAB on the Communities screen.
- NewCommunityModel + Material3 form: name, description, image URL,
  rules, moderator pubkeys, relay requests/approvals URLs.
- Signs a kind 34550 CommunityDefinitionEvent and auto-follows it so
  it appears under "Mine".
- Account.sendCommunityDefinition helper.

Misc
- Extracted parseTopFilterOrDefault helper in LocalPreferences to keep
  the existing inner load method under the JVM method-size limit.

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip72ModCommunities/approval/TagArrayBuilderExt.kt

@@ -26,6 +26,7 @@ import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
 import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
 import com.vitorpamplona.quartz.nip01Core.tags.aTag.toATag
 import com.vitorpamplona.quartz.nip01Core.tags.events.toETagArray
+import com.vitorpamplona.quartz.nip01Core.tags.people.PTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.CommunityDefinitionEvent
 
 fun TagArrayBuilder<CommunityPostApprovalEvent>.community(event: EventHintBundle<CommunityDefinitionEvent>) = add(event.toATag().toATagArray())
@@ -37,6 +38,4 @@ fun TagArrayBuilder<CommunityPostApprovalEvent>.approved(event: EventHintBundle<
     }
 }
 
-fun TagArrayBuilder<CommunityPostApprovalEvent>.notifyAuthor(event: EventHintBundle<Event>) {
-    add(event.toETagArray())
-}
+fun TagArrayBuilder<CommunityPostApprovalEvent>.notifyAuthor(event: EventHintBundle<Event>) = add(PTag.assemble(event.event.pubKey, event.authorHomeRelay))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip72ModCommunities/definition/TagArrayBuilderExt.kt

@@ -21,18 +21,22 @@
 package com.vitorpamplona.quartz.nip72ModCommunities.definition
 
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
-import com.vitorpamplona.quartz.nip23LongContent.tags.ImageTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.DescriptionTag
+import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.ImageTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.ModeratorTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.NameTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.RelayTag
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.tags.RulesTag
+import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
 
 fun TagArrayBuilder<CommunityDefinitionEvent>.name(name: String) = addUnique(NameTag.assemble(name))
 
 fun TagArrayBuilder<CommunityDefinitionEvent>.description(description: String) = addUnique(DescriptionTag.assemble(description))
 
-fun TagArrayBuilder<CommunityDefinitionEvent>.image(webUrl: String) = addUnique(ImageTag.assemble(webUrl))
+fun TagArrayBuilder<CommunityDefinitionEvent>.image(
+    webUrl: String,
+    dimensions: DimensionTag? = null,
+) = addUnique(ImageTag.assemble(webUrl, dimensions))
 
 fun TagArrayBuilder<CommunityDefinitionEvent>.rules(rules: String) = addUnique(RulesTag.assemble(rules))
 

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip72ModCommunities/definition/tags/RelayTag.kt

@@ -35,6 +35,10 @@ class RelayTag(
     companion object {
         const val TAG_NAME = "relay"
 
+        const val MARKER_AUTHOR = "author"
+        const val MARKER_REQUESTS = "requests"
+        const val MARKER_APPROVALS = "approvals"
+
         fun parse(tag: Array<String>): RelayTag? {
             ensure(tag.has(1)) { return null }
             ensure(tag[0] == TAG_NAME) { return null }