feat: geohash composer polish + hide the room's own cell in bubbles

- Center the composer identity avatar vertically instead of bottom-aligning
  it (the "post as me" picture was sinking to the bottom of the edit row).
- Halve the gap between the avatar and the text field (drop the avatar's end
  padding and nudge the field left into its fixed inset).
- Drop the divider line between the feed and the composer — the other chat
  screens don't use one, and the rounded field is separation enough.
- In a location room, suppress the room's own geohash in each message's
  footer/time row (every message repeats the room cell, so showing it is
  noise). Done via a new LocalChatSuppressGeohash composition-local, factored
  into both the footer-has-metadata gate and the footer render; any other
  geohash still shows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0172JoMccseEKenyWan6txWV

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/feed/ChatMessageCompose.kt

@@ -249,8 +249,11 @@ fun NormalChatNote(
     }
 
     // The footer shows on the last message of a run (for the time) and on any message
-    // carrying per-message metadata (expiration, geohash, PoW, legacy-DM marker).
-    val footerHasMeta = remember(note.event) { chatFooterHasMeta(note) }
+    // carrying per-message metadata (expiration, geohash, PoW, legacy-DM marker). In a geohash
+    // room every message repeats the room's own cell, so that geohash is suppressed and doesn't,
+    // by itself, force a footer row (see LocalChatSuppressGeohash).
+    val suppressGeohash = LocalChatSuppressGeohash.current
+    val footerHasMeta = remember(note.event, suppressGeohash) { chatFooterHasMeta(note, suppressGeohash) }
 
     // Only mount the reaction/zap chip row when the message actually has engagement.
     // The chips overlap the bubble's bottom edge, so the bubble reserves space beneath
@@ -458,6 +461,13 @@ val LocalChatDisplayNameResolver = compositionLocalOf<((Note) -> String?)?> { nu
  */
 val LocalChatShowSelfAuthorName = compositionLocalOf { false }
 
+/**
+ * The geohash of the location room currently open, or null outside one. Every message in that room
+ * repeats the room's own cell in its `g` tag, so the bubble footer suppresses this one geohash —
+ * showing it on every message is redundant noise. Any other geohash still renders.
+ */
+val LocalChatSuppressGeohash = compositionLocalOf<String?> { null }
+
 @Composable
 fun RenderReplyRow(
     note: Note,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/feed/ChatTimeAgo.kt

@@ -74,11 +74,17 @@ fun ChatTimeAgo(baseNote: Note) {
  * row) while still surfacing these per-message details that used to live in the
  * tap-to-expand "complete UI" detail row.
  */
-fun chatFooterHasMeta(note: Note): Boolean {
+fun chatFooterHasMeta(
+    note: Note,
+    // The location room's own cell, when open. A message whose only metadata is this geohash carries
+    // no footer-worthy detail (the room header already says where we are), so it doesn't force a row.
+    suppressGeohash: String? = null,
+): Boolean {
     val event = note.event ?: return false
+    val geo = event.geoHashOrScope()
     return event is PrivateDmEvent ||
         event.expiration() != null ||
-        event.geoHashOrScope() != null ||
+        (geo != null && geo != suppressGeohash) ||
         event.strongPoWOrNull() != null ||
         note.isPinnedInRelayGroup()
 }
@@ -102,7 +108,10 @@ fun ChatMessageFooter(
     nav: INav,
 ) {
     val event = note.event
-    val geo = remember(event) { event?.geoHashOrScope() }
+    val geoRaw = remember(event) { event?.geoHashOrScope() }
+    // Hide the room's own cell (repeated on every message here); keep any other geohash.
+    val suppressGeohash = LocalChatSuppressGeohash.current
+    val geo = if (geoRaw != null && geoRaw != suppressGeohash) geoRaw else null
     val pow = remember(event) { event?.strongPoWOrNull() }
 
     Row(verticalAlignment = Alignment.CenterVertically) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/geohashChat/GeohashChatScreen.kt

@@ -32,6 +32,7 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
@@ -39,7 +40,6 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.AlertDialog
-import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
@@ -78,6 +78,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.LocalChatActingI
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.LocalChatDisplayNameResolver
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.LocalChatReactOverride
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.LocalChatShowSelfAuthorName
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.LocalChatSuppressGeohash
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.RefreshingChatroomFeedView
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.publicChannels.dal.ChannelFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.publicChannels.datasource.ChannelFilterAssemblerSubscription
@@ -203,6 +204,7 @@ private fun GeohashChatRoom(
             Box(Modifier.weight(1f).fillMaxWidth()) {
                 CompositionLocalProvider(
                     LocalChatShowSelfAuthorName provides true,
+                    LocalChatSuppressGeohash provides geohash,
                     LocalChatActingIdentities provides myPubKeys,
                     LocalChatReactOverride provides { note, reaction ->
                         identity.react(note, reaction, newMessageModel.geohashPostAsSelf)
@@ -233,20 +235,21 @@ private fun GeohashChatRoom(
                 }
             }
 
-            HorizontalDivider()
             if (newMessageModel.geohashTeleported) {
                 TeleportIndicatorRow()
             }
             Row(
                 modifier = Modifier.fillMaxWidth(),
-                verticalAlignment = Alignment.Bottom,
+                verticalAlignment = Alignment.CenterVertically,
             ) {
                 GeohashIdentityAvatar(
                     model = newMessageModel,
                     accountViewModel = accountViewModel,
                     onRequestPostAsSelf = { showPostAsSelfWarning = true },
                 )
-                Box(Modifier.weight(1f)) {
+                // Nudge the field left into the composer's fixed 10dp inset so the picture sits close
+                // to the field rather than across a wide gap.
+                Box(Modifier.weight(1f).offset(x = (-4).dp)) {
                     EditFieldRow(
                         channelScreenModel = newMessageModel,
                         accountViewModel = accountViewModel,
@@ -288,7 +291,7 @@ private fun GeohashIdentityAvatar(
             )
 
     Column(
-        modifier = Modifier.padding(start = 8.dp, end = 4.dp, bottom = 4.dp),
+        modifier = Modifier.padding(start = 8.dp, end = 0.dp),
         horizontalAlignment = Alignment.CenterHorizontally,
     ) {
         if (postAsSelf) {