android: tune global bottom tabs to telegram-like style

android/CHANGELOG.md

@@ -487,3 +487,10 @@
 - Replaced custom pill-row main bar with compact `NavigationBar` inside rounded container for stable 4-tab layout on small screens.
 - Added bottom content paddings for `Chats/Contacts/Settings/Profile` pages so content is not obscured by the floating main bar.
 - Raised chats management FAB offset to avoid overlap with the global bottom bar.
+
+### Step 78 - Telegram-like bottom tabs visual tuning
+- Tuned shared main bar visual style to better match Telegram references:
+  - rounded floating container with subtle elevation,
+  - unified selected/unselected item colors,
+  - stable 4-item navigation with icons + labels.
+- Kept scroll-hide/show behavior and page-level navigation unchanged.

android/app/src/main/java/ru/daemonlord/messenger/ui/navigation/AppNavGraph.kt

@@ -15,7 +15,7 @@ import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.windowInsetsPadding
-import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Chat
 import androidx.compose.material.icons.filled.Contacts
@@ -26,6 +26,7 @@ import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.NavigationBar
 import androidx.compose.material3.NavigationBarItem
+import androidx.compose.material3.NavigationBarItemDefaults
 import androidx.compose.material3.Surface
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
@@ -43,6 +44,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.ContextCompat
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -298,13 +300,15 @@ private fun MainBottomBar(
         modifier = Modifier
             .padding(horizontal = 12.dp)
             .fillMaxWidth(),
-        shape = CircleShape,
+        shape = RoundedCornerShape(28.dp),
-        color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.92f),
+        color = MaterialTheme.colorScheme.surface.copy(alpha = 0.88f),
+        tonalElevation = 2.dp,
+        shadowElevation = 8.dp,
     ) {
         NavigationBar(
-            containerColor = androidx.compose.ui.graphics.Color.Transparent,
+            containerColor = Color.Transparent,
             tonalElevation = 0.dp,
-            modifier = Modifier.padding(horizontal = 8.dp),
+            modifier = Modifier.padding(horizontal = 6.dp, vertical = 2.dp),
         ) {
             NavigationBarItem(
                 selected = currentRoute == Routes.Chats,
@@ -313,6 +317,14 @@ private fun MainBottomBar(
                 label = {
                     androidx.compose.material3.Text("Chats", maxLines = 1, overflow = TextOverflow.Ellipsis)
                 },
+                alwaysShowLabel = true,
+                colors = NavigationBarItemDefaults.colors(
+                    selectedIconColor = MaterialTheme.colorScheme.primary,
+                    selectedTextColor = MaterialTheme.colorScheme.primary,
+                    indicatorColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.18f),
+                    unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                    unselectedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                ),
             )
             NavigationBarItem(
                 selected = currentRoute == Routes.Contacts,
@@ -321,6 +333,14 @@ private fun MainBottomBar(
                 label = {
                     androidx.compose.material3.Text("Contacts", maxLines = 1, overflow = TextOverflow.Ellipsis)
                 },
+                alwaysShowLabel = true,
+                colors = NavigationBarItemDefaults.colors(
+                    selectedIconColor = MaterialTheme.colorScheme.primary,
+                    selectedTextColor = MaterialTheme.colorScheme.primary,
+                    indicatorColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.18f),
+                    unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                    unselectedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                ),
             )
             NavigationBarItem(
                 selected = currentRoute == Routes.Settings,
@@ -329,6 +349,14 @@ private fun MainBottomBar(
                 label = {
                     androidx.compose.material3.Text("Settings", maxLines = 1, overflow = TextOverflow.Ellipsis)
                 },
+                alwaysShowLabel = true,
+                colors = NavigationBarItemDefaults.colors(
+                    selectedIconColor = MaterialTheme.colorScheme.primary,
+                    selectedTextColor = MaterialTheme.colorScheme.primary,
+                    indicatorColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.18f),
+                    unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                    unselectedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                ),
             )
             NavigationBarItem(
                 selected = currentRoute == Routes.Profile,
@@ -337,6 +365,14 @@ private fun MainBottomBar(
                 label = {
                     androidx.compose.material3.Text("Profile", maxLines = 1, overflow = TextOverflow.Ellipsis)
                 },
+                alwaysShowLabel = true,
+                colors = NavigationBarItemDefaults.colors(
+                    selectedIconColor = MaterialTheme.colorScheme.primary,
+                    selectedTextColor = MaterialTheme.colorScheme.primary,
+                    indicatorColor = MaterialTheme.colorScheme.primary.copy(alpha = 0.18f),
+                    unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                    unselectedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                ),
             )
         }
     }