fix: only resolve the draft note when there is a version to save

The versions collector resolved draftNote = account.getOrCreateDraftNote(...)
on every emission, including the content-less initial tick (~1s after the
composer opens). That touched the lateinit account before any user input; if
it were ever unset at that moment the throw would kill the collectLatest
coroutine and silently stop all draft saves for that composer.

Move the resolve inside the `if (it > 0)` guard, co-located with the save, so
account is only read once a real edit exists. The open-a-draft-then-send-
without-editing case is still covered by the explicit refresh in load().

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016aj4ajZ4uQ58Bqts7riJ5i

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/nip22Comments/CommentPostViewModel.kt

@@ -145,9 +145,9 @@ open class CommentPostViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     sendDraftSync()
                 }
             }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/privateDM/send/ChatNewMessageViewModel.kt

@@ -138,9 +138,9 @@ class ChatNewMessageViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/send/ChannelNewMessageViewModel.kt

@@ -121,9 +121,9 @@ open class ChannelNewMessageViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip23LongForm/LongFormPostViewModel.kt

@@ -140,9 +140,9 @@ class LongFormPostViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/discover/nip99Classifieds/NewProductViewModel.kt

@@ -126,9 +126,9 @@ open class NewProductViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/ShortNotePostViewModel.kt

@@ -195,9 +195,9 @@ open class ShortNotePostViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/chat/NestNewMessageViewModel.kt

@@ -126,9 +126,9 @@ open class NestNewMessageViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/publicMessages/NewPublicMessageViewModel.kt

@@ -141,9 +141,9 @@ class NewPublicMessageViewModel :
     init {
         viewModelScope.launch(Dispatchers.IO) {
             draftTag.versions.collectLatest {
-                draftNote = account.getOrCreateDraftNote(draftTag.current)
                 // don't save the first
                 if (it > 0) {
+                    draftNote = account.getOrCreateDraftNote(draftTag.current)
                     accountViewModel.launchSigner {
                         sendDraftSync()
                     }