android: add floating bottom nav shell to chat list

android/CHANGELOG.md

@@ -259,3 +259,8 @@
 - Kept unread/mention/pinned/muted indicators while aligning row structure closer to Telegram list pattern.
 - Added floating compose FAB placeholder at bottom-right in chat list screen.
 - Updated Telegram UI batch-2 checklist chat-list parity items.
+
+### Step 43 - Chat list / floating bottom navigation shell
+- Added floating rounded bottom navigation container on chat list screen.
+- Added active tab visual state (Chats selected) with pill styling.
+- Updated Telegram UI checklists for bottom-nav shell parity (batch 1 and batch 2).

android/app/src/main/java/ru/daemonlord/messenger/ui/chats/ChatListScreen.kt

@@ -25,6 +25,7 @@ import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Tab
 import androidx.compose.material3.TabRow
 import androidx.compose.material3.Text
@@ -192,10 +193,27 @@ fun ChatListScreen(
                 onClick = {},
                 modifier = Modifier
                     .align(Alignment.BottomEnd)
-                    .padding(16.dp),
+                    .padding(end = 16.dp, bottom = 88.dp),
             ) {
                 Text("+")
             }
+            Surface(
+                modifier = Modifier
+                    .align(Alignment.BottomCenter)
+                    .padding(horizontal = 16.dp, vertical = 14.dp),
+                shape = CircleShape,
+                color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.92f),
+            ) {
+                Row(
+                    modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    BottomNavPill(label = "Chats", selected = true, onClick = {})
+                    BottomNavPill(label = "Contacts", selected = false, onClick = {})
+                    BottomNavPill(label = "Settings", selected = false, onClick = {})
+                    BottomNavPill(label = "Profile", selected = false, onClick = {})
+                }
+            }
         }
     }
 }
@@ -363,6 +381,34 @@ private fun ArchiveRow(
     }
 }
 
+@Composable
+private fun BottomNavPill(
+    label: String,
+    selected: Boolean,
+    onClick: () -> Unit,
+) {
+    Surface(
+        shape = CircleShape,
+        color = if (selected) {
+            MaterialTheme.colorScheme.primaryContainer
+        } else {
+            MaterialTheme.colorScheme.surface
+        },
+        modifier = Modifier.clickable(onClick = onClick),
+    ) {
+        Text(
+            text = label,
+            modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp),
+            style = MaterialTheme.typography.labelMedium,
+            color = if (selected) {
+                MaterialTheme.colorScheme.onPrimaryContainer
+            } else {
+                MaterialTheme.colorScheme.onSurface
+            },
+        )
+    }
+}
+
 @Composable
 private fun CenterState(
     text: String?,

docs/android-ui-batch-1-checklist.md

@@ -4,8 +4,8 @@
 Источник: первая пачка скринов (настройки, приватность, контакты, профиль, архив, общий список чатов)
 
 ## P0 — Navigation + Layout Shell
-- [ ] Floating bottom navigation в rounded контейнере с полупрозрачным тёмным фоном.
-- [ ] Активный tab в фиолетовом pill-состоянии, неактивные — белые/серые.
+- [x] Floating bottom navigation в rounded контейнере с полупрозрачным тёмным фоном.
+- [x] Активный tab в фиолетовом pill-состоянии, неактивные — белые/серые.
 - [ ] Safe area для status/nav bars на всех экранах списка/настроек/профиля.
 
 ## P0 — Settings Visual System

docs/android-ui-batch-2-checklist.md

@@ -51,7 +51,7 @@
 - [x] Badge unread справа.
 - [x] Иконки delivery/camera/attachments в preview строке.
 - [x] Плавающий FAB (compose/new chat) справа снизу.
-- [ ] Floating bottom navigation с blur/dark container и активным фиолетовым tab.
+- [x] Floating bottom navigation с blur/dark container и активным фиолетовым tab.
 
 ## P2 — Motion & Polish
 - [ ] Плавная анимация открытия reaction/context menu (scale+fade).