fix(firebase): replace placeholder Firebase config, update initializer and home screen wiring

app/build.gradle.kts

@@ -13,13 +13,17 @@ android {
     compileSdk = 35
 
     defaultConfig {
-        applicationId = "com.couplesconnect.app"
+        applicationId = "couples.connect.dev"
         minSdk = 26
         targetSdk = 35
         versionCode = 1
         versionName = "0.1.0"
     }
 
+    buildFeatures {
+        buildConfig = true
+    }
+
     buildTypes {
         release {
             isMinifyEnabled = false

app/src/main/java/com/couplesconnect/app/core/firebase/FirebaseInitializer.kt

@@ -1,6 +1,6 @@
 package com.couplesconnect.app.core.firebase
 
-import com.couplesconnect.app.BuildConfig
+import com.couplesconnect.app.BuildConfig  // generated by buildFeatures { buildConfig = true }
 import com.google.firebase.appcheck.FirebaseAppCheck
 import com.google.firebase.appcheck.playintegrity.PlayIntegrityAppCheckProviderFactory
 import javax.inject.Inject

app/src/main/java/com/couplesconnect/app/di/DatabaseModule.kt

@@ -7,6 +7,7 @@ import androidx.datastore.preferences.preferencesDataStoreFile
 import androidx.datastore.preferences.core.PreferenceDataStoreFactory
 import androidx.room.Room
 import com.couplesconnect.app.data.local.AppDatabase
+import com.google.firebase.firestore.FirebaseFirestore
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
@@ -44,4 +45,8 @@ object DatabaseModule {
         PreferenceDataStoreFactory.create {
             context.preferencesDataStoreFile("settings")
         }
+
+    @Provides
+    @Singleton
+    fun provideFirestore(): FirebaseFirestore = FirebaseFirestore.getInstance()
 }

app/src/main/java/com/couplesconnect/app/ui/home/HomeScreen.kt

@@ -10,14 +10,18 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawingPadding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Favorite
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Surface
@@ -57,6 +61,7 @@ fun HomeScreen(
         onCategory = { categoryId -> onNavigate(AppRoute.questionCategory(categoryId)) },
         onHistory = { onNavigate(AppRoute.ANSWER_HISTORY) },
         onSettings = { onNavigate(AppRoute.SETTINGS) },
+        onInvite = { onNavigate(AppRoute.CREATE_INVITE) },
         onRefresh = viewModel::loadHome
     )
 }
@@ -69,6 +74,7 @@ private fun HomeContent(
     onCategory: (String) -> Unit,
     onHistory: () -> Unit,
     onSettings: () -> Unit,
+    onInvite: () -> Unit,
     onRefresh: () -> Unit
 ) {
     Box(
@@ -96,6 +102,10 @@ private fun HomeContent(
                 streakCount = state.streakCount
             )
 
+            if (!state.isPaired && !state.isLoading) {
+                InvitePartnerCard(onInvite = onInvite)
+            }
+
             when {
                 state.isLoading -> LoadingHomeCard()
                 state.error != null -> ErrorHomeCard(message = state.error, onRefresh = onRefresh)
@@ -158,6 +168,49 @@ private fun HomeHeader(
     }
 }
 
+@Composable
+private fun InvitePartnerCard(onInvite: () -> Unit) {
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        shape = RoundedCornerShape(26.dp),
+        colors = CardDefaults.cardColors(containerColor = Color(0xFFFFF4F0)),
+        elevation = CardDefaults.cardElevation(defaultElevation = 6.dp)
+    ) {
+        Row(
+            modifier = Modifier.padding(18.dp),
+            horizontalArrangement = Arrangement.spacedBy(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Icon(
+                Icons.Filled.Favorite,
+                contentDescription = null,
+                tint = Color(0xFFE07A5F),
+                modifier = Modifier.size(28.dp)
+            )
+            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                Text(
+                    text = "Invite your partner",
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.SemiBold,
+                    color = Color(0xFF27211F)
+                )
+                Text(
+                    text = "Share a code to connect and start answering together.",
+                    style = MaterialTheme.typography.bodySmall,
+                    color = Color(0xFF4E4642)
+                )
+            }
+            Button(
+                onClick = onInvite,
+                shape = RoundedCornerShape(14.dp),
+                colors = ButtonDefaults.buttonColors(containerColor = Color(0xFFE07A5F))
+            ) {
+                Text("Invite", color = Color.White)
+            }
+        }
+    }
+}
+
 @Composable
 private fun DailyQuestionCard(
     question: Question?,
@@ -519,6 +572,7 @@ fun HomeScreenPreview() {
         onCategory = {},
         onHistory = {},
         onSettings = {},
+        onInvite = {},
         onRefresh = {}
     )
 }

app/src/main/java/com/couplesconnect/app/ui/home/HomeViewModel.kt

@@ -37,7 +37,8 @@ data class HomeUiState(
     val categories: List<HomeCategorySummary> = emptyList(),
     val answerStats: HomeAnswerStats = HomeAnswerStats(),
     val partnerName: String? = null,
-    val streakCount: Int = 0
+    val streakCount: Int = 0,
+    val isPaired: Boolean = false
 )
 
 @HiltViewModel
@@ -81,7 +82,8 @@ class HomeViewModel @Inject constructor(
                         dailyQuestion = dailyQuestion,
                         categories = categories,
                         partnerName = partnerName,
-                        streakCount = couple?.streakCount ?: 0
+                        streakCount = couple?.streakCount ?: 0,
+                        isPaired = couple != null
                     )
                 }
             } catch (e: Exception) {