Respect system 24-hour setting in clock time format (#1619)

## Description
<!-- Describe the changes in detail -->
The clock ignored the device's system 24-hour preference:
getTimeFormatter derived 12/24h purely from the locale. This reads
DateFormat.is24HourFormat and builds the time pattern from it, so the
clock follows the system setting.

### Related issues
<!-- If this is a new feature or a change, there must be a discussion in
an issue first, reference the issue here -->
<!-- If fixing a bug, reference the bug issue here, or describe the bug,
including steps to reproduce -->

### Testing
<!-- Describe how this change was tested and on what device(s) -->
Tested on the emulator toggling the system 24-hour setting on/off.
assembleDefaultDebug, testDefaultDebugUnitTest and pre-commit (ktlint)
pass.

## Screenshots
<!-- Please include screenshots if the PR alters any UI elements -->

## AI or LLM usage
<!-- If you used any AI or LLM assistance, please list where in the code
and how you tested it -->
The analysis and the fix were done by me with AI assistance (Claude). I
wrote the description myself; the English wording was polished with AI.
I understand the code and can maintain it.

app/src/main/java/com/github/damontecres/wholphin/ui/Formatting.kt

@@ -1,5 +1,7 @@
 package com.github.damontecres.wholphin.ui
 
+import android.content.Context
+import android.text.format.DateFormat
 import androidx.annotation.StringRes
 import androidx.compose.foundation.text.appendInlineContent
 import androidx.compose.ui.text.AnnotatedString
@@ -12,19 +14,35 @@ import org.jellyfin.sdk.model.api.MediaSegmentType
 import timber.log.Timber
 import java.time.LocalDate
 import java.time.LocalDateTime
+import java.time.LocalTime
+import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 import java.time.format.DateTimeParseException
 import java.time.format.FormatStyle
+import java.util.Date
 import java.util.Locale
 
-private var timeFormatter: DateTimeFormatter =
-    DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withLocale(Locale.getDefault())
+/**
+ * Format the time-of-day of [time] honouring the device's 12/24-hour setting and the current
+ * locale. [context] should be an Activity/composition context (e.g. `LocalContext.current`) so an
+ * in-app language switch (`AppCompatDelegate.setApplicationLocales`) is reflected; the application
+ * context may carry a stale locale.
+ */
+fun formatTime(
+    context: Context,
+    time: LocalDateTime,
+): String = formatTime(context, time.toLocalTime())
 
-fun getTimeFormatter(): DateTimeFormatter {
-    if (timeFormatter.locale != Locale.getDefault()) {
-        timeFormatter = timeFormatter.withLocale(Locale.getDefault())
-    }
-    return timeFormatter
+fun formatTime(
+    context: Context,
+    time: LocalTime,
+): String {
+    val instant =
+        time
+            .atDate(LocalDate.now())
+            .atZone(ZoneId.systemDefault())
+            .toInstant()
+    return DateFormat.getTimeFormat(context).format(Date.from(instant))
 }
 
 private var dateFormatter: DateTimeFormatter =

app/src/main/java/com/github/damontecres/wholphin/ui/components/QuickDetails.kt

@@ -11,6 +11,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalResources
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.AnnotatedString
@@ -25,7 +26,7 @@ import com.github.damontecres.wholphin.R
 import com.github.damontecres.wholphin.data.model.QuickDetailsData
 import com.github.damontecres.wholphin.preferences.DisplayToggle
 import com.github.damontecres.wholphin.ui.dot
-import com.github.damontecres.wholphin.ui.getTimeFormatter
+import com.github.damontecres.wholphin.ui.formatTime
 import com.github.damontecres.wholphin.ui.util.LocalClock
 import com.github.damontecres.wholphin.ui.util.LocalInterfaceCustomization
 import org.jellyfin.sdk.model.DateTime
@@ -138,21 +139,11 @@ fun TimeRemaining(
     modifier: Modifier = Modifier,
     textStyle: TextStyle = MaterialTheme.typography.titleSmall,
 ) {
-    val resources = LocalResources.current
     val now by LocalClock.current.now
-    val remainingStr =
-        remember(remaining, now, resources) {
-            val endTimeStr = getTimeFormatter().format(now.plusSeconds(remaining.inWholeSeconds))
-            buildAnnotatedString {
-                dot()
-                append(resources.getString(R.string.ends_at, endTimeStr))
-            }
-        }
-    Text(
-        text = remainingStr,
-        style = textStyle,
-        maxLines = 1,
+    EndsAt(
+        endsAt = now.plusSeconds(remaining.inWholeSeconds),
         modifier = modifier,
+        textStyle = textStyle,
     )
 }
 
@@ -163,9 +154,10 @@ fun EndsAt(
     textStyle: TextStyle = MaterialTheme.typography.titleSmall,
 ) {
     val resources = LocalResources.current
+    val context = LocalContext.current
     val remainingStr =
-        remember(endsAt, resources) {
-            val endTimeStr = getTimeFormatter().format(endsAt)
+        remember(endsAt, resources, context) {
+            val endTimeStr = formatTime(context, endsAt)
             buildAnnotatedString {
                 dot()
                 append(resources.getString(R.string.ends_at, endTimeStr))

app/src/main/java/com/github/damontecres/wholphin/ui/detail/PlaylistDetails.kt

@@ -94,7 +94,7 @@ import com.github.damontecres.wholphin.ui.detail.music.MusicViewModel
 import com.github.damontecres.wholphin.ui.enableMarquee
 import com.github.damontecres.wholphin.ui.equalsNotNull
 import com.github.damontecres.wholphin.ui.formatDateTime
-import com.github.damontecres.wholphin.ui.getTimeFormatter
+import com.github.damontecres.wholphin.ui.formatTime
 import com.github.damontecres.wholphin.ui.ifElse
 import com.github.damontecres.wholphin.ui.launchDefault
 import com.github.damontecres.wholphin.ui.launchIO
@@ -803,10 +803,11 @@ fun PlaylistItem(
         trailingContent = {
             item?.data?.runTimeTicks?.ticks?.roundMinutes?.let { duration ->
                 val now by LocalClock.current.now
+                val context = LocalContext.current
                 val endTimeStr =
-                    remember(item, now) {
+                    remember(item, now, context) {
                         val endTime = now.toLocalTime().plusSeconds(duration.inWholeSeconds)
-                        getTimeFormatter().format(endTime)
+                        formatTime(context, endTime)
                     }
                 Column {
                     Text(

app/src/main/java/com/github/damontecres/wholphin/ui/playback/overlay/PlaybackController.kt

@@ -22,6 +22,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
@@ -32,7 +33,7 @@ import androidx.tv.material3.MaterialTheme
 import androidx.tv.material3.Text
 import com.github.damontecres.wholphin.R
 import com.github.damontecres.wholphin.data.model.BaseItem
-import com.github.damontecres.wholphin.ui.getTimeFormatter
+import com.github.damontecres.wholphin.ui.formatTime
 import com.github.damontecres.wholphin.ui.playback.ControllerViewState
 import com.github.damontecres.wholphin.ui.playback.PlaybackDialogType
 import kotlinx.coroutines.delay
@@ -199,8 +200,9 @@ fun Controller(
                     )
                 }
 
+                val context = LocalContext.current
                 var endTimeStr by remember { mutableStateOf("...") }
-                LaunchedEffect(player) {
+                LaunchedEffect(player, context) {
                     while (isActive) {
                         val remaining =
                             (player.duration - player.currentPosition)
@@ -208,7 +210,7 @@ fun Controller(
                                 .toLong()
                                 .milliseconds
                         val endTime = LocalTime.now().plusSeconds(remaining.inWholeSeconds)
-                        endTimeStr = getTimeFormatter().format(endTime)
+                        endTimeStr = formatTime(context, endTime)
                         delay(1.seconds)
                     }
                 }

app/src/main/java/com/github/damontecres/wholphin/ui/util/LocalClock.kt

@@ -7,7 +7,8 @@ import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.compositionLocalOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import com.github.damontecres.wholphin.ui.getTimeFormatter
+import androidx.compose.ui.platform.LocalContext
+import com.github.damontecres.wholphin.ui.formatTime
 import com.github.damontecres.wholphin.util.WholphinDispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.isActive
@@ -25,19 +26,20 @@ data class Clock(
      */
     val now: MutableState<LocalDateTime> = mutableStateOf(LocalDateTime.now()),
     /**
-     * The current time formatted as a string with [getTimeFormatter]
+     * The current time formatted as a string; populated by [ProvideLocalClock] via [formatTime].
      */
-    val timeString: MutableState<String> = mutableStateOf(getTimeFormatter().format(now.value)),
+    val timeString: MutableState<String> = mutableStateOf(""),
 )
 
 @Composable
 fun ProvideLocalClock(content: @Composable () -> Unit) {
+    val context = LocalContext.current
     val clock = remember { Clock() }
-    LaunchedEffect(Unit) {
+    LaunchedEffect(context) {
         withContext(WholphinDispatchers.Default) {
             while (isActive) {
                 val now = LocalDateTime.now()
-                val time = getTimeFormatter().format(now)
+                val time = formatTime(context, now)
                 clock.now.value = now
                 clock.timeString.value = time
                 delay(2_000)