fix: ajout du FAB + sur tous les écrans (absent de MainScreen.Scaffold)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/java/com/planify/mobile/ui/MainScreen.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.FolderOpen
+import androidx.compose.material.icons.outlined.Add
 import androidx.compose.material.icons.outlined.CalendarMonth
 import androidx.compose.material.icons.outlined.FilterList
 import androidx.compose.material.icons.outlined.Inbox
@@ -19,9 +20,11 @@ import androidx.compose.material.icons.outlined.Settings
 import androidx.compose.material.icons.outlined.Today
 import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalDrawerSheet
 import androidx.compose.material3.ModalNavigationDrawer
 import androidx.compose.material3.NavigationDrawerItem
@@ -45,6 +48,7 @@ import androidx.navigation.compose.rememberNavController
 import com.planify.mobile.ui.navigation.DrawerViewModel
 import com.planify.mobile.ui.navigation.PlanifyNavHost
 import com.planify.mobile.ui.navigation.Route
+import com.planify.mobile.ui.task.TaskEditSheet
 import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -57,6 +61,13 @@ fun MainScreen(viewModel: DrawerViewModel = hiltViewModel()) {
     val navBackStack by navController.currentBackStackEntryAsState()
     val currentRoute = navBackStack?.destination?.route
 
+    var showCreateTask by remember { mutableStateOf(false) }
+    val inboxProjectId = projects.find { it.isInbox }?.id ?: ""
+    val createProjectId = if (currentRoute?.startsWith("project/") == true)
+        currentRoute.removePrefix("project/")
+    else
+        inboxProjectId
+
     val drawerTitles = mapOf(
         Route.Inbox.path to "Inbox",
         Route.Today.path to "Aujourd'hui",
@@ -167,11 +178,28 @@ fun MainScreen(viewModel: DrawerViewModel = hiltViewModel()) {
                     },
                 )
             },
+            floatingActionButton = {
+                if (currentRoute != Route.Settings.path) {
+                    FloatingActionButton(
+                        onClick = { showCreateTask = true },
+                        containerColor = MaterialTheme.colorScheme.primary,
+                    ) {
+                        Icon(Icons.Outlined.Add, contentDescription = "Nouvelle tâche", tint = MaterialTheme.colorScheme.onPrimary)
+                    }
+                }
+            },
         ) { padding ->
             PlanifyNavHost(
                 navController = navController,
                 modifier = Modifier.padding(padding),
             )
+
+            if (showCreateTask) {
+                TaskEditSheet(
+                    projectId = createProjectId,
+                    onDismiss = { showCreateTask = false },
+                )
+            }
         }
     }
 }