fix(#5): address PR review — share ExpandedFab, inject GetExpenseSummary, column-chart spec

- Add ui/components/ExpandedFab.kt with ExpandedFab + MiniFab helpers; HomeScreen and ExpenseListScreen both consume it, the tab-collapsing LaunchedEffect in ExpenseListScreen is hoisted to its Content()
- Inject GetExpenseSummary in HomeScreenModel; drive summary via dateRange.flatMapLatest { getExpenseSummary.await(it) } (fixes the period-filter total-card flicker) and drop the inline combine(expenses, dateRange) recomputation
- Hoist isFabExpanded out of HomeScreenModel into HomeScreen.Content() so the FAB state is local to the composable
- Convert HomeScreenModel.exportToCsv from a callback to a suspend fun returning Result<Unit>; the screen does the snackbar dispatch on the coroutineScope
- Consolidate DateRangeOption label mapping to a single DateRangeOption.labelRes() / .labelText() pair (one source of truth)
- Rename FAB string keys to shared fab_manual / fab_import and drop the home_fab_* duplicates
- Update docs/04-implementation-plan.md and .opencode/agent/implementor.md Charts sections to reflect the Vico 2.0.0 column-chart-with-legend substitution (Vico 2.0.0 has no pie layer)

.opencode/agent/implementor.md

@@ -217,7 +217,7 @@ class AppPreference(private val store: PreferenceStore) {
 ### Charts
 
 - **Vico** (`com.patrykandpatrick.vico:compose`, `compose-m3`, `core`) is the only charting library used.
-- `HomeScreen` dashboard renders a pie chart from `ExpenseSummary.byCategory` via Vico's `Chart` composable. No Canvas drawing for charts.
+- `HomeScreen` dashboard renders a Vico `ColumnCartesianLayer` (one bar per category) from `ExpenseSummary.byCategory`, with a small `Row { colored swatch; category name; amount }` legend below the chart that carries the per-category color. Vico 2.0.0's `cartesian` package only exposes `Line` / `Column` / `Candlestick` layers (no pie), so the dashboard uses a column chart with a legend; per-category colors live in the legend, not in the chart. No Canvas drawing for charts.
 - Apache 2.0 license, Compose-native, no AndroidView wrapper.
 
 ---
@@ -231,7 +231,7 @@ class AppPreference(private val store: PreferenceStore) {
 | Koin | 4.2.2 | DI |
 | Room | 2.7.1 | Local DB |
 | PDFBox-Android | 2.0.27.0 | PDF text extraction |
-| Vico (compose / compose-m3 / core) | 2.x | Charts (pie / bar) |
+| Vico (compose / compose-m3 / core) | 2.x | Charts (column with legend) |
 | Okio | (transitive) | CSV write |
 
 ---

app/src/main/java/dev/achmad/ledgerr/ui/components/ExpandedFab.kt

@@ -0,0 +1,87 @@
+package dev.achmad.ledgerr.ui.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.Add
+import androidx.compose.material.icons.outlined.Close
+import androidx.compose.material3.FloatingActionButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.SmallFloatingActionButton
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun ExpandedFab(
+    expanded: Boolean,
+    onToggle: () -> Unit,
+    modifier: Modifier = Modifier,
+    actions: @Composable ColumnScope.() -> Unit,
+) {
+    Column(
+        modifier = modifier,
+        horizontalAlignment = Alignment.End,
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        AnimatedVisibility(
+            visible = expanded,
+            enter = fadeIn() + expandVertically(),
+            exit = fadeOut() + shrinkVertically(),
+        ) {
+            Column(
+                horizontalAlignment = Alignment.End,
+                verticalArrangement = Arrangement.spacedBy(12.dp),
+                content = actions,
+            )
+        }
+        FloatingActionButton(onClick = onToggle) {
+            Icon(
+                imageVector = if (expanded) Icons.Outlined.Close else Icons.Outlined.Add,
+                contentDescription = null,
+            )
+        }
+    }
+}
+
+@Composable
+fun MiniFab(
+    label: String,
+    icon: ImageVector,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Row(
+        modifier = modifier,
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        Surface(
+            shape = MaterialTheme.shapes.small,
+            color = MaterialTheme.colorScheme.surface,
+            shadowElevation = 2.dp,
+        ) {
+            Text(
+                text = label,
+                modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+                style = MaterialTheme.typography.bodyMedium,
+            )
+        }
+        SmallFloatingActionButton(onClick = onClick) {
+            Icon(imageVector = icon, contentDescription = null)
+        }
+    }
+}

app/src/main/java/dev/achmad/ledgerr/ui/screens/expenses/ExpenseListScreen.kt

@@ -1,14 +1,8 @@
 package dev.achmad.ledgerr.ui.screens.expenses
 
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.expandVertically
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.combinedClickable
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
@@ -23,24 +17,19 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.outlined.Add
-import androidx.compose.material.icons.outlined.Close
 import androidx.compose.material.icons.outlined.Edit
 import androidx.compose.material.icons.outlined.Repeat
 import androidx.compose.material.icons.outlined.Search
 import androidx.compose.material.icons.outlined.UploadFile
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SmallFloatingActionButton
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
-import androidx.compose.material3.Surface
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Tab
 import androidx.compose.material3.PrimaryTabRow
@@ -60,7 +49,6 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
@@ -74,7 +62,9 @@ import dev.achmad.ledgerr.domain.expense.model.ExpenseWithCategory
 import dev.achmad.ledgerr.domain.recurring.model.RecurringExpenseWithCategory
 import dev.achmad.ledgerr.domain.recurring.model.RecurringInterval
 import dev.achmad.ledgerr.ui.components.AppBar
+import dev.achmad.ledgerr.ui.components.ExpandedFab
 import dev.achmad.ledgerr.ui.components.ExportAction
+import dev.achmad.ledgerr.ui.components.MiniFab
 import dev.achmad.ledgerr.ui.components.SingleSelectFilterChipGroup
 import dev.achmad.ledgerr.ui.screens.add_edit_expense.AddEditExpenseScreen
 import dev.achmad.ledgerr.ui.screens.add_edit_recurring.AddEditRecurringScreen
@@ -105,6 +95,11 @@ object ExpenseListScreen : Screen {
         val pagerState = rememberPagerState(pageCount = { 2 })
         val selectedTab = pagerState.currentPage
 
+        var isFabExpanded by remember { mutableStateOf(false) }
+        LaunchedEffect(selectedTab) {
+            isFabExpanded = false
+        }
+
         Scaffold(
             topBar = {
                 AppBar(
@@ -129,12 +124,38 @@ object ExpenseListScreen : Screen {
             },
             snackbarHost = { SnackbarHost(snackbarHostState) },
             floatingActionButton = {
-                TabAwareFab(
+                ExpandedFab(
-                    selectedTab = selectedTab,
+                    expanded = isFabExpanded,
-                    onAddExpense = { navigator.push(AddEditExpenseScreen(expenseId = null)) },
+                    onToggle = { isFabExpanded = !isFabExpanded },
-                    onImportBankStatement = { navigator.push(ImportBankStatementScreen) },
+                ) {
-                    onAddRecurring = { navigator.push(AddEditRecurringScreen(recurringId = null)) },
+                    if (selectedTab == 0) {
-                )
+                        MiniFab(
+                            label = stringResource(R.string.fab_manual),
+                            icon = Icons.Outlined.Edit,
+                            onClick = {
+                                isFabExpanded = false
+                                navigator.push(AddEditExpenseScreen(expenseId = null))
+                            },
+                        )
+                        MiniFab(
+                            label = stringResource(R.string.fab_import),
+                            icon = Icons.Outlined.UploadFile,
+                            onClick = {
+                                isFabExpanded = false
+                                navigator.push(ImportBankStatementScreen)
+                            },
+                        )
+                    } else {
+                        MiniFab(
+                            label = stringResource(R.string.expense_list_fab_add_recurring),
+                            icon = Icons.Outlined.Repeat,
+                            onClick = {
+                                isFabExpanded = false
+                                navigator.push(AddEditRecurringScreen(recurringId = null))
+                            },
+                        )
+                    }
+                }
             },
         ) { padding ->
             Column(
@@ -414,99 +435,6 @@ private fun RecurringRow(
     }
 }
 
-@Composable
-private fun TabAwareFab(
-    selectedTab: Int,
-    onAddExpense: () -> Unit,
-    onImportBankStatement: () -> Unit,
-    onAddRecurring: () -> Unit,
-) {
-    var expanded by remember { mutableStateOf(false) }
-
-    LaunchedEffect(selectedTab) {
-        expanded = false
-    }
-
-    Column(
-        horizontalAlignment = Alignment.End,
-        verticalArrangement = Arrangement.spacedBy(12.dp),
-    ) {
-        AnimatedVisibility(
-            visible = expanded,
-            enter = fadeIn() + expandVertically(),
-            exit = fadeOut() + shrinkVertically(),
-        ) {
-            Column(
-                horizontalAlignment = Alignment.End,
-                verticalArrangement = Arrangement.spacedBy(12.dp),
-            ) {
-                if (selectedTab == 0) {
-                    MiniFab(
-                        label = stringResource(R.string.expense_list_fab_manual),
-                        icon = Icons.Outlined.Edit,
-                        onClick = {
-                            expanded = false
-                            onAddExpense()
-                        },
-                    )
-                    MiniFab(
-                        label = stringResource(R.string.expense_list_fab_import),
-                        icon = Icons.Outlined.UploadFile,
-                        onClick = {
-                            expanded = false
-                            onImportBankStatement()
-                        },
-                    )
-                } else {
-                    MiniFab(
-                        label = stringResource(R.string.expense_list_fab_add_recurring),
-                        icon = Icons.Outlined.Repeat,
-                        onClick = {
-                            expanded = false
-                            onAddRecurring()
-                        },
-                    )
-                }
-            }
-        }
-        FloatingActionButton(
-            onClick = { expanded = !expanded },
-        ) {
-            Icon(
-                imageVector = if (expanded) Icons.Outlined.Close else Icons.Outlined.Add,
-                contentDescription = null,
-            )
-        }
-    }
-}
-
-@Composable
-private fun MiniFab(
-    label: String,
-    icon: ImageVector,
-    onClick: () -> Unit,
-) {
-    Row(
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.spacedBy(8.dp),
-    ) {
-        Surface(
-            shape = MaterialTheme.shapes.small,
-            color = MaterialTheme.colorScheme.surface,
-            shadowElevation = 2.dp,
-        ) {
-            Text(
-                text = label,
-                modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
-                style = MaterialTheme.typography.bodyMedium,
-            )
-        }
-        SmallFloatingActionButton(onClick = onClick) {
-            Icon(imageVector = icon, contentDescription = null)
-        }
-    }
-}
-
 private fun DateRangeFilter.labelRes(): Int = when (this) {
     DateRangeFilter.ALL -> R.string.expense_list_filter_all
     DateRangeFilter.THIS_WEEK -> R.string.expense_list_filter_this_week

app/src/main/java/dev/achmad/ledgerr/ui/screens/home/HomeScreen.kt

@@ -1,10 +1,5 @@
 package dev.achmad.ledgerr.ui.screens.home
 
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.expandVertically
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -22,20 +17,17 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.outlined.Add
 import androidx.compose.material.icons.outlined.Close
 import androidx.compose.material.icons.outlined.Edit
 import androidx.compose.material.icons.outlined.Settings
 import androidx.compose.material.icons.outlined.UploadFile
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SmallFloatingActionButton
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
@@ -44,13 +36,14 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
@@ -75,7 +68,9 @@ import dev.achmad.ledgerr.domain.expense.model.ExpenseSummary
 import dev.achmad.ledgerr.domain.expense.model.ExpenseWithCategory
 import dev.achmad.ledgerr.domain.preference.DateRangeOption
 import dev.achmad.ledgerr.ui.components.AppBar
+import dev.achmad.ledgerr.ui.components.ExpandedFab
 import dev.achmad.ledgerr.ui.components.ExportAction
+import dev.achmad.ledgerr.ui.components.MiniFab
 import dev.achmad.ledgerr.ui.components.SingleSelectFilterChipGroup
 import dev.achmad.ledgerr.ui.screens.add_edit_expense.AddEditExpenseScreen
 import dev.achmad.ledgerr.ui.screens.category.CategoryScreen
@@ -99,10 +94,10 @@ object HomeScreen : Screen {
         val expenses by screenModel.expenses.collectAsState()
         val summary by screenModel.summary.collectAsState()
         val recurringBanner by screenModel.recurringBanner.collectAsState()
-        val isFabExpanded by screenModel.isFabExpanded.collectAsState()
 
         val snackbarHostState = remember { SnackbarHostState() }
         val coroutineScope = rememberCoroutineScope()
+        var isFabExpanded by remember { mutableStateOf(false) }
 
         val exportFailureText = stringResource(R.string.home_export_failure)
 
@@ -113,11 +108,10 @@ object HomeScreen : Screen {
                     actions = {
                         ExportAction(
                             onExportConfirmed = { range, uri ->
-                                screenModel.exportToCsv(uri, range) { result ->
+                                coroutineScope.launch {
+                                    val result = screenModel.exportToCsv(uri, range)
                                     if (result.isFailure) {
-                                        coroutineScope.launch {
+                                        snackbarHostState.showSnackbar(exportFailureText)
-                                            snackbarHostState.showSnackbar(exportFailureText)
-                                        }
                                     }
                                 }
                             },
@@ -135,10 +129,25 @@ object HomeScreen : Screen {
             floatingActionButton = {
                 ExpandedFab(
                     expanded = isFabExpanded,
-                    onToggle = screenModel::toggleFab,
+                    onToggle = { isFabExpanded = !isFabExpanded },
-                    onManual = { navigator.push(AddEditExpenseScreen(expenseId = null)) },
+                ) {
-                    onImport = { navigator.push(ImportBankStatementScreen) },
+                    MiniFab(
-                )
+                        label = stringResource(R.string.fab_manual),
+                        icon = Icons.Outlined.Edit,
+                        onClick = {
+                            isFabExpanded = false
+                            navigator.push(AddEditExpenseScreen(expenseId = null))
+                        },
+                    )
+                    MiniFab(
+                        label = stringResource(R.string.fab_import),
+                        icon = Icons.Outlined.UploadFile,
+                        onClick = {
+                            isFabExpanded = false
+                            navigator.push(ImportBankStatementScreen)
+                        },
+                    )
+                }
             },
         ) { padding ->
             DashboardContent(
@@ -269,12 +278,6 @@ private fun TotalCard(
     amount: Double,
     period: DateRangeOption,
 ) {
-    val periodLabel = stringResource(
-        when (period) {
-            DateRangeOption.THIS_WEEK -> R.string.home_period_this_week
-            DateRangeOption.THIS_MONTH -> R.string.home_period_this_month
-        }
-    )
     Surface(
         modifier = Modifier.fillMaxWidth(),
         shape = MaterialTheme.shapes.medium,
@@ -284,7 +287,7 @@ private fun TotalCard(
             modifier = Modifier.padding(16.dp),
         ) {
             Text(
-                text = stringResource(R.string.home_total, periodLabel),
+                text = stringResource(R.string.home_total, period.labelText()),
                 style = MaterialTheme.typography.labelMedium,
                 color = MaterialTheme.colorScheme.onPrimaryContainer,
             )
@@ -304,19 +307,19 @@ private fun PeriodFilter(
     onChange: (DateRangeOption) -> Unit,
 ) {
     SingleSelectFilterChipGroup(
-        options = DateRangeOption.entries.map { it to label(it) },
+        options = DateRangeOption.entries.map { it to it.labelText() },
-        selectedOption = selected to label(selected),
+        selectedOption = selected to selected.labelText(),
         onSelectionChanged = { (option, _) -> onChange(option) },
     )
 }
 
+private fun DateRangeOption.labelRes(): Int = when (this) {
+    DateRangeOption.THIS_WEEK -> R.string.home_period_this_week
+    DateRangeOption.THIS_MONTH -> R.string.home_period_this_month
+}
+
 @Composable
-private fun label(option: DateRangeOption): String = stringResource(
+private fun DateRangeOption.labelText(): String = stringResource(labelRes())
-    when (option) {
-        DateRangeOption.THIS_WEEK -> R.string.home_period_this_week
-        DateRangeOption.THIS_MONTH -> R.string.home_period_this_month
-    }
-)
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -472,77 +475,3 @@ private fun ExpenseRow(item: ExpenseWithCategory) {
         }
     }
 }
-
-@Composable
-private fun ExpandedFab(
-    expanded: Boolean,
-    onToggle: () -> Unit,
-    onManual: () -> Unit,
-    onImport: () -> Unit,
-) {
-    Column(
-        horizontalAlignment = Alignment.End,
-        verticalArrangement = Arrangement.spacedBy(12.dp),
-    ) {
-        AnimatedVisibility(
-            visible = expanded,
-            enter = fadeIn() + expandVertically(),
-            exit = fadeOut() + shrinkVertically(),
-        ) {
-            Column(
-                horizontalAlignment = Alignment.End,
-                verticalArrangement = Arrangement.spacedBy(12.dp),
-            ) {
-                MiniFab(
-                    label = stringResource(R.string.home_fab_manual),
-                    icon = Icons.Outlined.Edit,
-                    onClick = {
-                        onToggle()
-                        onManual()
-                    },
-                )
-                MiniFab(
-                    label = stringResource(R.string.home_fab_import),
-                    icon = Icons.Outlined.UploadFile,
-                    onClick = {
-                        onToggle()
-                        onImport()
-                    },
-                )
-            }
-        }
-        FloatingActionButton(onClick = onToggle) {
-            Icon(
-                imageVector = if (expanded) Icons.Outlined.Close else Icons.Outlined.Add,
-                contentDescription = null,
-            )
-        }
-    }
-}
-
-@Composable
-private fun MiniFab(
-    label: String,
-    icon: ImageVector,
-    onClick: () -> Unit,
-) {
-    Row(
-        verticalAlignment = Alignment.CenterVertically,
-        horizontalArrangement = Arrangement.spacedBy(8.dp),
-    ) {
-        Surface(
-            shape = MaterialTheme.shapes.small,
-            color = MaterialTheme.colorScheme.surface,
-            shadowElevation = 2.dp,
-        ) {
-            Text(
-                text = label,
-                modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
-                style = MaterialTheme.typography.bodyMedium,
-            )
-        }
-        SmallFloatingActionButton(onClick = onClick) {
-            Icon(imageVector = icon, contentDescription = null)
-        }
-    }
-}

app/src/main/java/dev/achmad/ledgerr/ui/screens/home/HomeScreenModel.kt

@@ -4,6 +4,7 @@ import android.net.Uri
 import cafe.adriel.voyager.core.model.ScreenModel
 import cafe.adriel.voyager.core.model.screenModelScope
 import dev.achmad.ledgerr.di.util.inject
+import dev.achmad.ledgerr.domain.expense.interactor.GetExpenseSummary
 import dev.achmad.ledgerr.domain.expense.interactor.GetExpenses
 import dev.achmad.ledgerr.domain.expense.model.DateRange
 import dev.achmad.ledgerr.domain.expense.model.Expense
@@ -15,12 +16,13 @@ import dev.achmad.ledgerr.domain.preference.ExpensePreference
 import dev.achmad.ledgerr.domain.recurring.interactor.ProcessDueRecurringExpenses
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -30,6 +32,7 @@ import kotlinx.coroutines.withContext
 @OptIn(ExperimentalCoroutinesApi::class)
 class HomeScreenModel(
     private val getExpenses: GetExpenses = inject(),
+    private val getExpenseSummary: GetExpenseSummary = inject(),
     private val processDueRecurring: ProcessDueRecurringExpenses = inject(),
     private val exportExpensesToCsv: ExportExpensesToCsv = inject(),
     private val expensePreference: ExpensePreference = inject(),
@@ -57,33 +60,22 @@ class HomeScreenModel(
             initialValue = emptyList(),
         )
 
-    val summary: StateFlow<ExpenseSummary?> = combine(expenses, dateRange) { list, range ->
+    val summary: StateFlow<ExpenseSummary?> = dateRange
-        if (list.isEmpty()) {
+        .flatMapLatest { range -> summaryFlow(range) }
-            null
+        .stateIn(
-        } else {
+            scope = screenModelScope,
-            ExpenseSummary(
+            started = SharingStarted.WhileSubscribed(5_000L),
-                totalAmount = list.sumOf { it.expense.amount },
+            initialValue = null,
-                byCategory = list
+        )
-                    .groupBy { it.expense.categoryId }
+
-                    .map { (_, group) ->
+    private fun summaryFlow(range: DateRange): Flow<ExpenseSummary?> = flow {
-                        group.first().category to group.sumOf { it.expense.amount }
+        val s = withContext(Dispatchers.IO) { getExpenseSummary.await(range) }
-                    }
+        emit(s.takeIf { it.byCategory.isNotEmpty() })
-                    .sortedByDescending { it.second },
+    }
-                period = range,
-            )
-        }
-    }.stateIn(
-        scope = screenModelScope,
-        started = SharingStarted.WhileSubscribed(5_000L),
-        initialValue = null,
-    )
 
     private val _recurringBanner = MutableStateFlow<List<Expense>?>(null)
     val recurringBanner: StateFlow<List<Expense>?> = _recurringBanner.asStateFlow()
 
-    private val _isFabExpanded = MutableStateFlow(false)
-    val isFabExpanded: StateFlow<Boolean> = _isFabExpanded.asStateFlow()
-
     init {
         screenModelScope.launch {
             val generated = withContext(Dispatchers.IO) { processDueRecurring.await() }
@@ -95,20 +87,12 @@ class HomeScreenModel(
         _selectedDateRange.value = option
     }
 
-    fun toggleFab() {
-        _isFabExpanded.value = !_isFabExpanded.value
-    }
-
     fun dismissRecurringBanner() {
         _recurringBanner.value = null
     }
 
-    fun exportToCsv(uri: Uri, range: DateRange, onResult: (Result<Unit>) -> Unit) {
+    suspend fun exportToCsv(uri: Uri, range: DateRange): Result<Unit> =
-        screenModelScope.launch {
+        withContext(Dispatchers.IO) { exportExpensesToCsv.await(range, uri) }
-            val result = withContext(Dispatchers.IO) { exportExpensesToCsv.await(range, uri) }
-            onResult(result)
-        }
-    }
 }
 
 private fun DateRangeOption.toDateRange(): DateRange = when (this) {

app/src/main/res/values/strings.xml

@@ -72,8 +72,6 @@
     <string name="expense_list_filter_all">All</string>
     <string name="expense_list_filter_this_week">This week</string>
     <string name="expense_list_filter_this_month">This month</string>
-    <string name="expense_list_fab_manual">Manual</string>
-    <string name="expense_list_fab_import">Import Bank Statement</string>
     <string name="expense_list_fab_add_recurring">Add Recurring</string>
     <string name="expense_list_delete_title">Delete expense?</string>
     <string name="expense_list_delete_message">This will permanently delete the expense.</string>
@@ -103,6 +101,10 @@
     <string name="add_edit_recurring_interval_monthly">Monthly</string>
     <string name="add_edit_recurring_interval_yearly">Yearly</string>
 
+    <!-- Shared FAB (issue #5) -->
+    <string name="fab_manual">Manual</string>
+    <string name="fab_import">Import Bank Statement</string>
+
     <!-- Home (issue #5) -->
     <string name="home_title">Ledgerr</string>
     <string name="home_total">Total %1$s</string>
@@ -115,8 +117,6 @@
         <item quantity="one">%d new recurring expense added</item>
         <item quantity="other">%d new recurring expenses added</item>
     </plurals>
-    <string name="home_fab_manual">Manual</string>
-    <string name="home_fab_import">Import Bank Statement</string>
     <string name="home_dashboard_empty">No expenses yet for this period</string>
     <string name="home_settings">Settings</string>
     <string name="home_export_failure">Export failed</string>

docs/04-implementation-plan.md

@@ -34,7 +34,7 @@ implementation(libs.vico.compose.m3)
 implementation(libs.vico.core)
 ```
 
-**Charts**: Vico 2.x Compose-native library. `HomeScreen` dashboard renders a pie chart from `ExpenseSummary.byCategory`. No custom Canvas drawing.
+**Charts**: Vico 2.x Compose-native library. `HomeScreen` dashboard renders a Vico `ColumnCartesianLayer` from `ExpenseSummary.byCategory`, with a small category legend (`Row { colored swatch; category name; amount }`) below the chart that carries the per-category color. Vico 2.0.0's `cartesian` package only exposes `Line` / `Column` / `Candlestick` layers (no pie), so the dashboard uses a column chart with the legend. No custom Canvas drawing.
 
 **No manifest permissions** — SAF handles file access.