feat(ui): implement tablet optimizations and gemini-style dynamic keyboard suggestion-hiding

app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt

@@ -21,10 +21,14 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.ime
+import androidx.compose.foundation.layout.isImeVisible
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
@@ -129,6 +133,11 @@ fun EmptyHero(userName: String, onPick: (String) -> Unit, modifier: Modifier = M
         now.format(DateTimeFormatter.ofPattern("EEE, d. MMMM · HH:mm", Locale.GERMAN))
     }
 
+    // Dynamic keyboard visibility check (Google Gemini style)
+    // When the soft keyboard is visible, we completely hide the Suggestion Pills
+    // to give the user maximum typing space and keep the layout extremely clean.
+    val isKeyboardOpen = WindowInsets.isImeVisible
+
     Column(
         modifier = modifier
             .fillMaxSize()
@@ -144,8 +153,12 @@ fun EmptyHero(userName: String, onPick: (String) -> Unit, modifier: Modifier = M
         Text("Was liegt an?", color = cs.onBackground, fontSize = 32.sp, fontWeight = FontWeight.Bold)
         Spacer(Modifier.height(8.dp))
         Text(dateLine, color = cs.onSurfaceVariant.copy(alpha = 0.7f), fontSize = 13.sp)
+        
+        if (!isKeyboardOpen) {
             Spacer(Modifier.height(32.dp))
             SuggestionPills(onPick)
+        }
+        
         Spacer(Modifier.height(142.dp)) // Clear the floating bottom dock
     }
 }

app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
@@ -23,6 +24,7 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.unit.dp
 import dev.kaizen.app.haptics.rememberHaptics
 import kotlinx.coroutines.delay
@@ -39,6 +41,10 @@ fun ChatScreen(userName: String = "Bruno") {
     var nextId by remember { mutableStateOf(0L) }
     var selectedMode by remember { mutableStateOf("Standard") }
 
+    // Tablet & Landscape optimization: Detect large screens and cap the content width
+    val configuration = LocalConfiguration.current
+    val isTablet = configuration.screenWidthDp > 600
+
     fun send(text: String) {
         val trimmed = text.trim()
         if (trimmed.isEmpty() || isStreaming) return
@@ -78,21 +84,24 @@ fun ChatScreen(userName: String = "Bruno") {
     }
 
     MeshBackground {
-        Box(Modifier.fillMaxSize()) {
+        Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
             // 1. Scrollable Chat Content
             // Stretches to the full screen, allowing bubbles to scroll cleanly behind the floating glass panels.
-            // Since the OS physically resizes the window when the keyboard opens, the Box container shrinks natively,
+            // Responsive width capping and centering on tablets.
-            // placing the bottom dock exactly on top of the keyboard. We use constant Paddings to clear the docks.
             if (messages.isEmpty()) {
                 EmptyHero(
                     userName = userName,
                     onPick = { haptics.tick(); send(it) },
-                    modifier = Modifier.fillMaxSize()
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .then(if (isTablet) Modifier.widthIn(max = 720.dp) else Modifier)
                 )
             } else {
                 LazyColumn(
                     state = listState,
-                    modifier = Modifier.fillMaxSize(),
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .then(if (isTablet) Modifier.widthIn(max = 720.dp) else Modifier),
                     contentPadding = PaddingValues(
                         top = 92.dp,    // Leaves luxurious room for the floating KaizenHeader + status bars
                         bottom = 152.dp, // Leaves luxurious room for the floating ModePills + ChatInput + bottom margins
@@ -105,20 +114,20 @@ fun ChatScreen(userName: String = "Bruno") {
                 }
             }
 
-            // 2. Floating Header (Translucent Frosted Glass)
+            // 2. Floating Header (Translucent Frosted Glass, responsive centering)
             KaizenHeader(
                 modifier = Modifier
                     .align(Alignment.TopCenter)
                     .statusBarsPadding()
+                    .then(if (isTablet) Modifier.widthIn(max = 720.dp) else Modifier)
             )
 
-            // 3. Floating Bottom Control Dock
+            // 3. Floating Bottom Control Dock (responsive centering and clear bottom margins)
-            // Positioned at the bottom of the window. When the keyboard is active, the OS resizes the window
-            // and this dock naturally sits exactly on top of the keyboard without any double-padding.
             Column(
                 modifier = Modifier
                     .align(Alignment.BottomCenter)
                     .navigationBarsPadding()
+                    .then(if (isTablet) Modifier.widthIn(max = 720.dp) else Modifier)
             ) {
                 ModePillsRow(selected = selectedMode, onSelect = { selectedMode = it; haptics.tick() })
                 Spacer(Modifier.height(10.dp))
@@ -128,7 +137,7 @@ fun ChatScreen(userName: String = "Bruno") {
                     onSend = { send(input) },
                     enabled = !isStreaming,
                 )
-                Spacer(Modifier.height(12.dp)) // Extra breathing margin at the bottom of the floating card
+                Spacer(Modifier.height(16.dp)) // Increased from 12.dp to 16.dp to completely clear keyboard edges on all screens!
             }
         }
     }