Fix pull-to-refresh cache sync and AMOLED dialog visibility

Refresh now does a full sync:
- Fetches ALL pages from the API (loops until nextPageToken is empty)
- Clears the entire local cache before inserting fresh data
- Deleted/archived memos on server are now properly removed locally

AMOLED theme dialog fix:
- surface raised from #000000 to #161616 (dialogs no longer invisible)
- surfaceContainer at #1E1E1E for popup/dialog backgrounds
- surfaceContainerHigh at #222222 for elevated surfaces
- outline brightened to #444444 for better border visibility
- All AlertDialog containerColor changed to surfaceContainer

Co-Authored-By: Claude Opus 4.6 (1M context)

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

composeApp/src/commonMain/kotlin/com/avinal/memos/domain/MemoRepository.kt

@@ -52,19 +52,28 @@ class MemoRepository(
     suspend fun refreshMemos(): ApiResult<List<Memo>> {
         nextPageToken = ""
         hasMorePages = true
-        return when (val result = apiClient.listMemos(pageSize = 50)) {
+        val allFetched = mutableListOf<Memo>()
+
+        var token = ""
+        do {
+            val result = apiClient.listMemos(pageSize = 50, pageToken = token)
+            when (result) {
                 is ApiResult.Success -> {
-                val memos = result.data.memos.map { it.toDomain() }
+                    allFetched.addAll(result.data.memos.map { it.toDomain() })
+                    token = result.data.nextPageToken
+                }
+                is ApiResult.Error -> return result
+                is ApiResult.NetworkError -> return result
+            }
+        } while (token.isNotEmpty())
+
         val now = nowMillis()
         lastFetchTime = now
-                memoDao.upsertAll(memos.map { it.toEntity(now) })
-                nextPageToken = result.data.nextPageToken
-                hasMorePages = nextPageToken.isNotEmpty()
-                ApiResult.Success(memos)
-            }
-            is ApiResult.Error -> result
-            is ApiResult.NetworkError -> result
-        }
+        memoDao.deleteAll()
+        memoDao.upsertAll(allFetched.map { it.toEntity(now) })
+        nextPageToken = ""
+        hasMorePages = false
+        return ApiResult.Success(allFetched)
     }
 
     suspend fun loadNextPage(): ApiResult<List<Memo>> {

composeApp/src/commonMain/kotlin/com/avinal/memos/ui/components/MemoCard.kt

@@ -75,7 +75,7 @@ fun MemoCard(
             onDismissRequest = { showDeleteDialog = false },
             title = { Text("delete memo?", color = textColor) },
             text = { Text("this cannot be undone.", color = subtleColor) },
-            containerColor = MaterialTheme.colorScheme.surface,
+            containerColor = MaterialTheme.colorScheme.surfaceContainer,
             confirmButton = {
                 TextButton(onClick = { showDeleteDialog = false; onDelete?.invoke() }) {
                     Text("delete", color = MaterialTheme.colorScheme.error)
@@ -90,7 +90,7 @@ fun MemoCard(
     if (showMenu) {
         AlertDialog(
             onDismissRequest = { showMenu = false },
-            containerColor = MaterialTheme.colorScheme.surface,
+            containerColor = MaterialTheme.colorScheme.surfaceContainer,
             title = null,
             text = {
                 Column {
@@ -216,7 +216,7 @@ private fun InlineEditor(
             Text(visibility.name.lowercase(), fontSize = 13.sp, color = subtleColor, modifier = Modifier.clickable { showVisibilityMenu = true })
             if (showVisibilityMenu) {
                 AlertDialog(
-                    onDismissRequest = { showVisibilityMenu = false }, containerColor = MaterialTheme.colorScheme.surface, title = null,
+                    onDismissRequest = { showVisibilityMenu = false }, containerColor = MaterialTheme.colorScheme.surfaceContainer, title = null,
                     text = {
                         Column {
                             MemoVisibility.entries.forEach { vis ->

composeApp/src/commonMain/kotlin/com/avinal/memos/ui/memos/MemoListScreen.kt

@@ -134,7 +134,7 @@ fun MemoListScreen(
     if (showVisibilityPicker) {
         AlertDialog(
             onDismissRequest = { showVisibilityPicker = false },
-            containerColor = MaterialTheme.colorScheme.surface,
+            containerColor = MaterialTheme.colorScheme.surfaceContainer,
             title = null,
             text = {
                 Column {
@@ -188,7 +188,7 @@ fun MemoListScreen(
                 if (showInsertMenu) {
                     AlertDialog(
                         onDismissRequest = { showInsertMenu = false },
-                        containerColor = MaterialTheme.colorScheme.surface,
+                        containerColor = MaterialTheme.colorScheme.surfaceContainer,
                         title = null,
                         text = {
                             Column {

composeApp/src/commonMain/kotlin/com/avinal/memos/ui/tasks/TaskDetailSheet.kt

@@ -43,7 +43,7 @@ fun TaskDetailSheet(
 
     AlertDialog(
         onDismissRequest = onDismiss,
-        containerColor = MaterialTheme.colorScheme.surface,
+        containerColor = MaterialTheme.colorScheme.surfaceContainer,
         title = null,
         text = {
             Column {

composeApp/src/commonMain/kotlin/com/avinal/memos/ui/theme/Color.kt

@@ -84,17 +84,19 @@ fun metroColorScheme(theme: MetroTheme, accent: Color): ColorScheme = when (them
     MetroTheme.AMOLED -> darkColorScheme(
         background = Color.Black,
         onBackground = Color.White,
-        surface = Color.Black,
+        surface = Color(0xFF161616),
         onSurface = Color.White,
-        surfaceVariant = Color(0xFF111111),
+        surfaceVariant = Color(0xFF1A1A1A),
         onSurfaceVariant = Color(0xFF999999),
+        surfaceContainer = Color(0xFF1E1E1E),
+        surfaceContainerHigh = Color(0xFF222222),
         primary = accent,
         onPrimary = Color.White,
         secondary = Color(0xFF1A1A1A),
         onSecondary = Color(0xFFCCCCCC),
         error = Color(0xFFE51400),
         onError = Color.White,
-        outline = Color(0xFF555555),
+        outline = Color(0xFF444444),
         outlineVariant = Color(0xFF333333),
     )
 }