Fix scroll spy + date overlay on first photo of each day

Scroll spy: use key(viewMode) around derivedStateOf so activeFolder
recomputes against the correct listState when switching modes.

Dense date markers: remove separate DAY_BOUNDARY row item entirely.
Date label ('Jul 28') now overlaid on the top-left corner of the first
photo in each new day — zero wasted vertical space.

src/main/kotlin/com/bolenpad/photophetch/ui/BrowseScreen.kt

@@ -100,31 +100,22 @@ fun BrowseScreen(state: AppState) {
                     }
                 }
 
-                // Dense mode: folder scroll index (accounts for day boundary markers)
+                // Dense mode: folder scroll index (photo rows only, no day boundary items)
                 val denseScrollIndex = remember(folderSections, columnCount) {
                     var idx = 0
                     folderSections.associate { folderSection ->
                         val startIdx = idx
                         idx += 1 // folder header
-                        val sorted = folderSection.allPhotos.sortedByDescending { it.dateTaken }
+                        idx += ((folderSection.allPhotos.size + columnCount - 1) / columnCount) // photo rows
-                        var lastDate: java.time.LocalDate? = null
-                        val zoneId = java.time.ZoneId.systemDefault()
-                        sorted.chunked(columnCount).forEach { row ->
-                            val rowDate = row.first().dateTaken.atZone(zoneId).toLocalDate()
-                            if (rowDate != lastDate) {
-                                if (lastDate != null) idx += 1 // day boundary marker
-                                lastDate = rowDate
-                            }
-                            idx += 1 // photo row
-                        }
                         folderSection.folder.name to startIdx
                     }
                 }
 
                 val folderScrollIndex = if (viewMode == ViewMode.GROUPED) groupedScrollIndex else denseScrollIndex
 
-                // Scroll spy: which folder is currently at the top of the visible area
+                // Scroll spy — keyed on viewMode so it recomposes when switching
-                val activeFolder by remember {
+                val activeFolder by key(viewMode) {
+                    remember {
                         derivedStateOf {
                             val firstVisible = listState.firstVisibleItemIndex
                             folderScrollIndex.entries
@@ -133,6 +124,7 @@ fun BrowseScreen(state: AppState) {
                                 ?: folderSections.firstOrNull()?.folder?.name
                         }
                     }
+                }
 
                 Row(modifier = Modifier.fillMaxSize()) {
                     // Left: folder jump list — jumps in whichever list is active

src/main/kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt

@@ -7,7 +7,6 @@ import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.CheckCircle
 import androidx.compose.material.icons.filled.Image
@@ -34,12 +33,9 @@ import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 
 /**
- * Dense grid view: photos flow as a tight grid per folder.
+ * Dense grid: folder header + flat photo rows per folder.
- * Folder headers separate sections. Day boundaries are marked with a
+ * Day boundaries shown as a date label overlaid on the top-left corner
- * thin rule + date label that scrolls inline with the photos — no
+ * of the first photo in each new day — no separate row, zero wasted space.
- * separate scrubber strip.
- *
- * Exposes [listState] so the parent can wire up the folder jump list.
  */
 @Composable
 fun DensePhotoGrid(
@@ -62,27 +58,35 @@ fun DensePhotoGrid(
     }
 
     val zoneId = ZoneId.systemDefault()
-    val dayFmt = remember { DateTimeFormatter.ofPattern("EEE, MMM d") }
+    val dayFmt = remember { DateTimeFormatter.ofPattern("MMM d") }
 
-    // Build flat item list per folder section
+    // Build items: FOLDER_HEADER | PHOTO_ROW (with optional dateLabel on first photo)
-    val items: List<GridItem> = buildList {
+    // dateLabel is set on the first photo of each new day within a folder
+    data class PhotoRow(
+        val photos: List<PhonePhoto>,
+        val dateLabel: String?,  // non-null on first row of a new day
+    )
+    data class Item(
+        val type: GridItemType,
+        val folderSection: FolderSection? = null,
+        val photoRow: PhotoRow? = null,
+    )
+
+    val items: List<Item> = buildList {
         folderSections.forEach { section ->
             if (section.allPhotos.isEmpty()) return@forEach
-            add(GridItem(GridItemType.FOLDER_HEADER, folderSection = section))
+            add(Item(GridItemType.FOLDER_HEADER, folderSection = section))
 
             val sorted = section.allPhotos.sortedByDescending { it.dateTaken }
             var lastDate: LocalDate? = null
 
-            sorted.chunked(columnCount).forEach { row ->
+            sorted.chunked(columnCount).forEach { rowPhotos ->
-                val rowDate = row.first().dateTaken.atZone(zoneId).toLocalDate()
+                val rowDate = rowPhotos.first().dateTaken.atZone(zoneId).toLocalDate()
-                // Emit a day boundary marker when the date changes
+                val label = if (rowDate != lastDate) {
-                if (rowDate != lastDate) {
-                    if (lastDate != null) { // don't emit before first row — folder header serves that
-                        add(GridItem(GridItemType.DAY_BOUNDARY, dayDate = rowDate))
-                    }
                     lastDate = rowDate
-                }
+                    dayFmt.format(rowDate)
-                add(GridItem(GridItemType.PHOTO_ROW, rowPhotos = row))
+                } else null
+                add(Item(GridItemType.PHOTO_ROW, photoRow = PhotoRow(rowPhotos, label)))
             }
         }
     }
@@ -98,8 +102,7 @@ fun DensePhotoGrid(
                 val item = items[idx]
                 when (item.type) {
                     GridItemType.FOLDER_HEADER -> "hdr-${item.folderSection!!.folder.name}"
-                    GridItemType.DAY_BOUNDARY -> "day-${item.folderSection?.folder?.name}-${item.dayDate}"
+                    else -> "row-${item.photoRow!!.photos.first().devicePath}"
-                    GridItemType.PHOTO_ROW -> "row-${item.rowPhotos!!.first().devicePath}"
                 }
             },
         ) { idx ->
@@ -117,43 +120,25 @@ fun DensePhotoGrid(
                         onDeselectAll = { onDeselectAllFolder(section.allPhotos) },
                     )
                 }
-                GridItemType.DAY_BOUNDARY -> {
+                else -> {
-                    // Thin rule with a small date label — scrolls with the grid
+                    val row = item.photoRow!!
-                    Row(
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .padding(horizontal = 8.dp, vertical = 4.dp),
-                        verticalAlignment = Alignment.CenterVertically,
-                        horizontalArrangement = Arrangement.spacedBy(8.dp),
-                    ) {
-                        HorizontalDivider(modifier = Modifier.width(16.dp), thickness = 0.5.dp,
-                            color = MaterialTheme.colorScheme.outlineVariant)
-                        Text(
-                            dayFmt.format(item.dayDate!!),
-                            fontSize = 10.sp,
-                            color = MaterialTheme.colorScheme.onSurfaceVariant,
-                            fontWeight = FontWeight.Medium,
-                        )
-                        HorizontalDivider(modifier = Modifier.weight(1f), thickness = 0.5.dp,
-                            color = MaterialTheme.colorScheme.outlineVariant)
-                    }
-                }
-                GridItemType.PHOTO_ROW -> {
                     Row(
                         modifier = Modifier.fillMaxWidth().padding(horizontal = 8.dp),
                         horizontalArrangement = Arrangement.spacedBy(2.dp),
                     ) {
-                        item.rowPhotos!!.forEach { photo ->
+                        row.photos.forEachIndexed { colIdx, photo ->
                             DenseThumb(
                                 photo = photo,
                                 isSelected = photo in selectedPhotos,
                                 device = device,
                                 adbBin = adbBin,
                                 onToggle = { onTogglePhoto(photo) },
+                                // Show date label only on first photo of the row that starts a new day
+                                dateLabel = if (colIdx == 0) row.dateLabel else null,
                                 modifier = Modifier.weight(1f),
                             )
                         }
-                        repeat(columnCount - item.rowPhotos.size) { Spacer(Modifier.weight(1f)) }
+                        repeat(columnCount - row.photos.size) { Spacer(Modifier.weight(1f)) }
                     }
                     Spacer(Modifier.height(2.dp))
                 }
@@ -169,6 +154,7 @@ private fun DenseThumb(
     device: DeviceInfo?,
     adbBin: String,
     onToggle: () -> Unit,
+    dateLabel: String?,
     modifier: Modifier = Modifier,
 ) {
     var thumbnail by remember(photo.devicePath) { mutableStateOf<ImageBitmap?>(null) }
@@ -195,6 +181,7 @@ private fun DenseThumb(
             .clickable(onClick = onToggle)
             .then(if (isSelected) Modifier.border(2.dp, MaterialTheme.colorScheme.primary) else Modifier),
     ) {
+        // Thumbnail or placeholder
         if (thumbnail != null) {
             Image(
                 bitmap = thumbnail!!,
@@ -207,29 +194,38 @@ private fun DenseThumb(
                 Modifier.fillMaxSize().background(MaterialTheme.colorScheme.surfaceVariant),
                 contentAlignment = Alignment.Center,
             ) {
-                Icon(
+                Icon(Icons.Default.Image, contentDescription = null,
-                    Icons.Default.Image,
+                    tint = MaterialTheme.colorScheme.outline, modifier = Modifier.size(20.dp))
-                    contentDescription = null,
-                    tint = MaterialTheme.colorScheme.outline,
-                    modifier = Modifier.size(20.dp),
-                )
             }
         }
 
+        // Date label overlaid on top-left — only on first photo of a new day
+        if (dateLabel != null) {
+            Text(
+                dateLabel,
+                fontSize = 9.sp,
+                fontWeight = FontWeight.SemiBold,
+                color = Color.White,
+                modifier = Modifier
+                    .align(Alignment.TopStart)
+                    .background(Color.Black.copy(alpha = 0.55f))
+                    .padding(horizontal = 4.dp, vertical = 2.dp),
+            )
+        }
+
+        // Video badge
         if (photo.mediaType == MediaType.VIDEO) {
             Badge(
                 containerColor = MaterialTheme.colorScheme.tertiary,
-                modifier = Modifier.align(Alignment.TopStart).padding(2.dp),
+                modifier = Modifier.align(Alignment.BottomStart).padding(2.dp),
             ) { Text("▶", style = MaterialTheme.typography.labelSmall) }
         }
 
+        // Selection checkmark
         if (isSelected) {
-            Icon(
+            Icon(Icons.Default.CheckCircle, contentDescription = null,
-                Icons.Default.CheckCircle,
-                contentDescription = null,
                 tint = MaterialTheme.colorScheme.primary,
-                modifier = Modifier.align(Alignment.TopEnd).padding(2.dp).size(16.dp),
+                modifier = Modifier.align(Alignment.TopEnd).padding(2.dp).size(16.dp))
-            )
         }
     }
 }