fix: branded splash back, wider month range, December title bug

- Restore the branded in-app splash (Calendarr name + icon + © Scarriffle),
  held until the first events load; logo sized to match the system splash so it
  doesn't visibly jump, name/copyright fade in
- Month calendar now scrolls 10 years back / 50 years ahead (was ±18 months)
- Fix month/quarter title: use Month.getDisplayName instead of the 'LLLL'
  pattern, which dropped the month name (e.g. December showed only '2026')

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

app/src/main/java/com/scarriffle/calendarr/ui/CalendarrRoot.kt

@@ -5,14 +5,20 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
+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.setValue
 import androidx.compose.ui.Modifier
 import androidx.hilt.navigation.compose.hiltViewModel
 import com.scarriffle.calendarr.ui.auth.LoginScreen
 import com.scarriffle.calendarr.ui.auth.ServerSetupScreen
 import com.scarriffle.calendarr.ui.calendar.CalendarScreen
+import com.scarriffle.calendarr.ui.calendar.CalendarViewModel
 import com.scarriffle.calendarr.ui.theme.CalendarrTheme
+import kotlinx.coroutines.delay
 
 @Composable
 fun CalendarrRoot(vm: MainViewModel = hiltViewModel()) {
@@ -24,9 +30,23 @@ fun CalendarrRoot(vm: MainViewModel = hiltViewModel()) {
             LocalLang provides L10n.resolved(settings.language),
             LocalAppSettings provides settings,
         ) {
-            // The system splash (installSplashScreen) covers startup until the
-            // first events are loaded, so there's no in-app splash here.
             Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
+                // Obtain the calendar VM early when logged in so events load
+                // *behind* the splash; the branded splash stays until ready.
+                val calendarVm: CalendarViewModel? =
+                    if (route == AppRoute.MAIN) hiltViewModel() else null
+                val dataReady = calendarVm?.ready?.collectAsState()?.value ?: true
+
+                var minElapsed by remember { mutableStateOf(false) }
+                var timedOut by remember { mutableStateOf(false) }
+                LaunchedEffect(Unit) { delay(500); minElapsed = true }
+                LaunchedEffect(Unit) { delay(6000); timedOut = true }
+
+                if (!minElapsed || (!dataReady && !timedOut)) {
+                    SplashScreen()
+                    return@Surface
+                }
+
                 when (route) {
                     AppRoute.SETUP -> ServerSetupScreen(onConfigured = vm::onServerConfigured)
                     AppRoute.LOGIN -> LoginScreen(
@@ -35,6 +55,7 @@ fun CalendarrRoot(vm: MainViewModel = hiltViewModel()) {
                         onBack = vm::switchServer,
                     )
                     AppRoute.MAIN -> CalendarScreen(
+                        vm = calendarVm!!,
                         onLogout = vm::logout,
                         onSwitchServer = vm::switchServer,
                         onSettingsChanged = vm::applyLocalSettings,