feat(drawer): add View section to switch Month/Week/Day

The slide-out panel gains a "View" section mirroring the top-bar switcher
pill: three NavigationDrawerItems (Month/Week/Day) with the current view
highlighted; tapping one selects that view and closes the drawer. The pill
stays as-is for quick cycling.

Centralise each view's label + icon as labelRes/icon extensions on
CalendarView so the pill and the drawer share one mapping. The drawer's
"Today" jump is dropped — the top-bar Today action and error-state retry
still cover it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarDrawer.kt

@@ -7,7 +7,6 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Settings
-import androidx.compose.material.icons.filled.Today
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
@@ -27,16 +26,19 @@ import de.jeanlucmakiola.calendula.ui.filter.CalendarFilterList
  * Visual language (kept deliberately small so sizes don't drift):
  *  - Drawer title — `titleLarge`
  *  - Section headers (e.g. "Calendars") — `titleSmall`, primary, text only
- *  - Nav items (Today / Settings) — Material `NavigationDrawerItem`
+ *  - Nav items (the views, Today / Settings) — Material `NavigationDrawerItem`
  *    (`labelLarge` label + a single 24dp leading icon)
  *
- * Hosts the per-calendar visibility filter (M3) inline — the calendar list with
- * its checkboxes lives here rather than in a separate sheet — plus the "today"
- * jump and a Settings entry (M4). The host screen owns the drawer state.
+ * The "View" section mirrors the top-bar switcher pill: tapping a view here
+ * selects it (and closes the drawer) rather than cycling. Also hosts the
+ * per-calendar visibility filter (M3) inline — the calendar list with its
+ * checkboxes lives here rather than in a separate sheet — plus a Settings
+ * entry (M4). The host screen owns the drawer state.
  */
 @Composable
 fun CalendarDrawer(
-    onToday: () -> Unit,
+    currentView: CalendarView,
+    onSelectView: (CalendarView) -> Unit,
     onSettings: () -> Unit,
 ) {
     ModalDrawerSheet {
@@ -47,14 +49,17 @@ fun CalendarDrawer(
                 modifier = Modifier.padding(horizontal = 28.dp, vertical = 24.dp),
             )
             HorizontalDivider()
-            Spacer(Modifier.height(8.dp))
-            NavigationDrawerItem(
-                icon = { Icon(Icons.Filled.Today, contentDescription = null) },
-                label = { Text(stringResource(R.string.month_today_action)) },
-                selected = false,
-                onClick = onToday,
-                modifier = Modifier.padding(horizontal = 12.dp),
-            )
+
+            DrawerSectionHeader(stringResource(R.string.view_section))
+            IMPLEMENTED_VIEWS.forEach { view ->
+                NavigationDrawerItem(
+                    icon = { Icon(view.icon, contentDescription = null) },
+                    label = { Text(stringResource(view.labelRes)) },
+                    selected = view == currentView,
+                    onClick = { onSelectView(view) },
+                    modifier = Modifier.padding(horizontal = 12.dp),
+                )
+            }
             Spacer(Modifier.height(8.dp))
             HorizontalDivider()
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarView.kt

@@ -1,5 +1,13 @@
 package de.jeanlucmakiola.calendula.ui.common
 
+import androidx.annotation.StringRes
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CalendarViewDay
+import androidx.compose.material.icons.filled.CalendarViewMonth
+import androidx.compose.material.icons.filled.CalendarViewWeek
+import androidx.compose.ui.graphics.vector.ImageVector
+import de.jeanlucmakiola.calendula.R
+
 /**
  * The top-level calendar views the user can switch between (spec M1).
  * Day is declared but not yet implemented (v0.5) — see [IMPLEMENTED_VIEWS].
@@ -10,6 +18,23 @@ enum class CalendarView {
     Day,
 }
 
+/** Switcher label, shared by the top-bar pill and the drawer's View section. */
+@get:StringRes
+val CalendarView.labelRes: Int
+    get() = when (this) {
+        CalendarView.Month -> R.string.view_month
+        CalendarView.Week -> R.string.view_week
+        CalendarView.Day -> R.string.view_day
+    }
+
+/** Leading icon for the view in the drawer's View section. */
+val CalendarView.icon: ImageVector
+    get() = when (this) {
+        CalendarView.Month -> Icons.Filled.CalendarViewMonth
+        CalendarView.Week -> Icons.Filled.CalendarViewWeek
+        CalendarView.Day -> Icons.Filled.CalendarViewDay
+    }
+
 /**
  * Views that actually have a screen today. The view-switcher pill cycles
  * through these in order.

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ViewSwitcherPill.kt

@@ -6,7 +6,6 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
-import de.jeanlucmakiola.calendula.R
 
 /**
  * Top-bar pill that shows the current view and cycles to the next one on tap
@@ -18,16 +17,11 @@ fun ViewSwitcherPill(
     onCycle: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    val labelRes = when (current) {
-        CalendarView.Month -> R.string.view_month
-        CalendarView.Week -> R.string.view_week
-        CalendarView.Day -> R.string.view_day
-    }
     FilledTonalButton(
         onClick = onCycle,
         shape = MaterialTheme.shapes.large,
         modifier = modifier,
     ) {
-        Text(stringResource(labelRes))
+        Text(stringResource(current.labelRes))
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/day/DayScreen.kt

@@ -157,7 +157,11 @@ fun DayScreen(
         gesturesEnabled = drawerState.isOpen,
         drawerContent = {
             CalendarDrawer(
-                onToday = { jumpToToday(); scope.launch { drawerState.close() } },
+                currentView = selectedView,
+                onSelectView = { view ->
+                    onSelectView(view)
+                    scope.launch { drawerState.close() }
+                },
                 onSettings = {
                     onOpenSettings()
                     scope.launch { drawerState.close() }

app/src/main/java/de/jeanlucmakiola/calendula/ui/month/MonthScreen.kt

@@ -130,8 +130,9 @@ fun MonthScreen(
         gesturesEnabled = drawerState.isOpen,
         drawerContent = {
             CalendarDrawer(
-                onToday = {
-                    jumpToToday()
+                currentView = selectedView,
+                onSelectView = { view ->
+                    onSelectView(view)
                     scope.launch { drawerState.close() }
                 },
                 onSettings = {

app/src/main/java/de/jeanlucmakiola/calendula/ui/week/WeekScreen.kt

@@ -162,7 +162,11 @@ fun WeekScreen(
         gesturesEnabled = drawerState.isOpen,
         drawerContent = {
             CalendarDrawer(
-                onToday = { jumpToToday(); scope.launch { drawerState.close() } },
+                currentView = selectedView,
+                onSelectView = { view ->
+                    onSelectView(view)
+                    scope.launch { drawerState.close() }
+                },
                 onSettings = {
                     onOpenSettings()
                     scope.launch { drawerState.close() }