feat: full Compose UI (auth, calendar, events, accounts, settings, profile)

- Root navigation (server setup -> login+2FA -> calendar) with settings-driven theme
- CalendarViewModel mirroring iOS CalendarStore: range-based caching,
  background prefetch, hidden/banished calendar filters, event CRUD
- Five calendar views: Month, Week, Day, Quarter, Agenda (shared time grid)
- Event detail + editor sheets (platform date/time pickers, color override,
  writable-calendar picker) across local/caldav/google/homeassistant
- Calendar filter sheet (per-calendar show/hide)
- Accounts screen: add/delete CalDAV, local, iCal, Home Assistant; list Google
- Settings: view/week-start/language/colors/contrast/hour-height/cache range,
  synced to server
- Profile: email, password change, 2FA enable/disable
- gradlew build (lint + tests + assemble) passes

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/src/main/java/com/scarriffle/calendarr/ui/menu/MenuSheet.kt

@@ -0,0 +1,74 @@
+package com.scarriffle.calendarr.ui.menu
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.AccountCircle
+import androidx.compose.material.icons.filled.Dns
+import androidx.compose.material.icons.filled.Logout
+import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material.icons.filled.Sync
+import androidx.compose.material.icons.filled.CalendarMonth
+import androidx.compose.material3.Divider
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+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.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.scarriffle.calendarr.ui.tr
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun MenuSheet(
+    isAdmin: Boolean,
+    onDismiss: () -> Unit,
+    onProfile: () -> Unit,
+    onAppearance: () -> Unit,
+    onAccounts: () -> Unit,
+    onSync: () -> Unit,
+    onLogout: () -> Unit,
+    onSwitchServer: () -> Unit,
+) {
+    ModalBottomSheet(onDismissRequest = onDismiss) {
+        Column(Modifier.fillMaxWidth().padding(bottom = 24.dp)) {
+            Text(
+                "Calendarr",
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.SemiBold,
+                modifier = Modifier.padding(horizontal = 20.dp, vertical = 8.dp),
+            )
+            MenuRow(Icons.Filled.AccountCircle, tr("menu.profile"), onProfile)
+            MenuRow(Icons.Filled.Palette, tr("menu.appearance"), onAppearance)
+            MenuRow(Icons.Filled.CalendarMonth, tr("menu.accounts"), onAccounts)
+            Divider(Modifier.padding(vertical = 4.dp))
+            MenuRow(Icons.Filled.Sync, tr("menu.sync"), onSync)
+            Divider(Modifier.padding(vertical = 4.dp))
+            MenuRow(Icons.Filled.Logout, tr("menu.logout"), onLogout)
+            MenuRow(Icons.Filled.Dns, tr("server.switch"), onSwitchServer)
+        }
+    }
+}
+
+@Composable
+private fun MenuRow(icon: ImageVector, label: String, onClick: () -> Unit) {
+    Row(
+        Modifier.fillMaxWidth().clickable(onClick = onClick).padding(horizontal = 20.dp, vertical = 14.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Icon(icon, contentDescription = null, tint = MaterialTheme.colorScheme.onSurfaceVariant)
+        Spacer(Modifier.width(18.dp))
+        Text(label, style = MaterialTheme.typography.bodyLarge)
+    }
+}