fix(ime): union nav-bar and IME insets on the two remaining bare-Scaffold forms

Sweep of every imePadding() in the app for the same nav-bar-over-IME
double-count fixed for the chats. Two more bare Material3 Scaffold screens
applied the scaffold content padding (which carries the nav-bar inset) and
then imePadding() without consuming in between, so the nav bar stacked on top
of the IME while the keyboard was up:

- NewGeohashChatScreen (geohash create form)
- MarmotGroupInfoScreen (has the add-member search field)

Both now consumeWindowInsets(pad) before imePadding(), matching the idiom the
other forms already use. Every other imePadding() call was verified fine:
DisappearingScaffold-based screens are handled by the scaffold's own
reservation, dialogs/bottom sheets carry no nav-bar content padding, and the
rest either apply imePadding() alone at a root or already use the
navigationBarsPadding()/consumeWindowInsets union.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012dT2RLbPZzan2hULL2cmc6

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

@@ -25,6 +25,7 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.consumeWindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.imePadding
@@ -106,6 +107,9 @@ fun NewGeohashChatScreen(
                 .fillMaxSize()
                 .padding(top = pad.calculateTopPadding(), bottom = pad.calculateBottomPadding())
                 .padding(horizontal = 16.dp)
+                // consume the scaffold insets so the trailing imePadding() only adds the part of
+                // the IME the nav-bar padding above doesn't already cover (union, not a sum).
+                .consumeWindowInsets(pad)
                 .verticalScroll(rememberScrollState())
                 .imePadding(),
             verticalArrangement = Arrangement.spacedBy(20.dp),

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/marmotGroup/MarmotGroupInfoScreen.kt

@@ -32,6 +32,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.consumeWindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.imePadding
@@ -171,6 +172,9 @@ fun MarmotGroupInfoScreen(
                 Modifier
                     .fillMaxSize()
                     .padding(padding)
+                    // consume the scaffold insets so imePadding() unions with the nav-bar inset in
+                    // `padding` instead of stacking on top of it while the keyboard is up.
+                    .consumeWindowInsets(padding)
                     .imePadding(),
         ) {
             // Group header section (fixed at top)