Dense view: inline day markers + fix folder jump list

Replace date scrubber strip with inline day boundary markers:
a thin rule + 'Mon, Jul 28' label that scrolls with the photos.
No separate panel — markers live in the grid flow.

Fix folder jump list in Dense mode: maintain separate denseListState
and denseScrollIndex (accounting for day boundary items). activeFolder
scroll spy now reads from whichever listState is active.

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

@@ -80,23 +80,49 @@ fun BrowseScreen(state: AppState) {
             is PhotoListState.Loaded -> {
                 // Build ordered list of (folder, photos-by-day) for the unified scroll
                 val folderSections = buildFolderSections(pl)
-                val listState = rememberLazyListState()
+                val groupedListState = rememberLazyListState()
+                val denseListState = rememberLazyListState()
                 val scope = rememberCoroutineScope()
 
-                // Map folder name → first item index in the lazy list
+                val listState = if (viewMode == ViewMode.GROUPED) groupedListState else denseListState
-                val folderScrollIndex = remember(folderSections, columnCount) {
+
+                // Grouped mode: folder scroll index (accounts for day headers)
+                val groupedScrollIndex = remember(folderSections, columnCount) {
                     var idx = 0
                     folderSections.associate { (folder, byDay) ->
                         val startIdx = idx
                         idx += 1 // folder header
                         byDay.forEach { (_, dayPhotos) ->
-                            if (dayPhotos.size >= 3) idx += 1 // day header only for dense days
+                            if (dayPhotos.size >= 3) idx += 1
-                            idx += ((dayPhotos.size + columnCount - 1) / columnCount) // photo rows
+                            idx += ((dayPhotos.size + columnCount - 1) / columnCount)
                         }
                         folder.name to startIdx
                     }
                 }
 
+                // Dense mode: folder scroll index (accounts for day boundary markers)
+                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 }
+                        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
                 val activeFolder by remember {
                     derivedStateOf {
@@ -109,7 +135,7 @@ fun BrowseScreen(state: AppState) {
                 }
 
                 Row(modifier = Modifier.fillMaxSize()) {
-                    // Left: folder jump list
+                    // Left: folder jump list — jumps in whichever list is active
                     FolderJumpList(
                         folders = pl.folders,
                         activeFolder = activeFolder,
@@ -130,7 +156,7 @@ fun BrowseScreen(state: AppState) {
                             selectedPhotos = selectedPhotos,
                             device = device,
                             adbBin = config.adbPath ?: "adb",
-                            listState = listState,
+                            listState = groupedListState,
                             columnCount = columnCount,
                             onTogglePhoto = { state.togglePhotoSelection(it) },
                             onSelectAllFolder = { folder ->
@@ -159,6 +185,7 @@ fun BrowseScreen(state: AppState) {
                             device = device,
                             adbBin = config.adbPath ?: "adb",
                             columnCount = columnCount,
+                            listState = denseListState,
                             onTogglePhoto = { state.togglePhotoSelection(it) },
                             onSelectAllFolder = { folder ->
                                 folder.forEach { p ->

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

@@ -11,7 +11,6 @@ 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
-import androidx.compose.material.icons.filled.RadioButtonUnchecked
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -21,7 +20,6 @@ import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.toComposeImageBitmap
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.bolenpad.photophetch.model.DeviceInfo
@@ -29,7 +27,6 @@ import com.bolenpad.photophetch.model.MediaType
 import com.bolenpad.photophetch.model.PhonePhoto
 import com.bolenpad.photophetch.util.ThumbnailCache
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import org.jetbrains.skia.Image as SkiaImage
 import java.time.LocalDate
@@ -37,13 +34,12 @@ import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 
 /**
- * Dense grid view with a date scrubber strip on the left edge.
+ * Dense grid view: photos flow as a tight grid per folder.
+ * Folder headers separate sections. Day boundaries are marked with a
+ * thin rule + date label that scrolls inline with the photos — no
+ * separate scrubber strip.
  *
- * Photos flow as a flat grid per folder, with a folder divider header
+ * Exposes [listState] so the parent can wire up the folder jump list.
- * between each folder. No day-header rows break up the grid within a folder.
- *
- * Layout:
- *   [28dp scrubber] [2dp gap] [photo grid fills remaining width]
  */
 @Composable
 fun DensePhotoGrid(
@@ -52,6 +48,7 @@ fun DensePhotoGrid(
     device: DeviceInfo?,
     adbBin: String,
     columnCount: Int,
+    listState: LazyListState,
     onTogglePhoto: (PhonePhoto) -> Unit,
     onSelectAllFolder: (List<PhonePhoto>) -> Unit,
     onDeselectAllFolder: (List<PhonePhoto>) -> Unit,
@@ -65,65 +62,34 @@ fun DensePhotoGrid(
     }
 
     val zoneId = ZoneId.systemDefault()
-    val listState = rememberLazyListState()
+    val dayFmt = remember { DateTimeFormatter.ofPattern("EEE, MMM d") }
-    val scope = rememberCoroutineScope()
 
-    // Build flat item list: folder header + photo rows per section
+    // Build flat item list per folder section
     val items: List<GridItem> = buildList {
         folderSections.forEach { section ->
             if (section.allPhotos.isEmpty()) return@forEach
             add(GridItem(GridItemType.FOLDER_HEADER, folderSection = section))
-            section.allPhotos
-                .sortedByDescending { it.dateTaken }
-                .chunked(columnCount)
-                .forEach { row -> add(GridItem(GridItemType.PHOTO_ROW, rowPhotos = row)) }
-        }
-    }
 
-    // Build date scrubber data from photo rows only
+            val sorted = section.allPhotos.sortedByDescending { it.dateTaken }
-    val photoRowIndices: List<Pair<LocalDate, Int>> = buildList {
             var lastDate: LocalDate? = null
-        items.forEachIndexed { idx, item ->
+
-            if (item.type == GridItemType.PHOTO_ROW) {
+            sorted.chunked(columnCount).forEach { row ->
-                val date = item.rowPhotos!!.first().dateTaken.atZone(zoneId).toLocalDate()
+                val rowDate = row.first().dateTaken.atZone(zoneId).toLocalDate()
-                if (date != lastDate) {
+                // Emit a day boundary marker when the date changes
-                    add(date to idx)
+                if (rowDate != lastDate) {
-                    lastDate = date
+                    if (lastDate != null) { // don't emit before first row — folder header serves that
+                        add(GridItem(GridItemType.DAY_BOUNDARY, dayDate = rowDate))
+                    }
+                    lastDate = rowDate
+                }
+                add(GridItem(GridItemType.PHOTO_ROW, rowPhotos = row))
             }
         }
     }
-    }.sortedByDescending { it.first }
 
-    val monthFmt = remember { DateTimeFormatter.ofPattern("MMM") }
-    val dayFmt = remember { DateTimeFormatter.ofPattern("d") }
-    val totalItems = items.size
-
-    Row(modifier = modifier.fillMaxSize()) {
-
-        // ── Date scrubber strip ───────────────────────────────────────────
-        Box(
-            modifier = Modifier
-                .width(28.dp)
-                .fillMaxHeight()
-                .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f))
-        ) {
-            if (totalItems > 0) {
-                ScrubberOverlay(
-                    scrubberDates = photoRowIndices,
-                    totalRows = totalItems,
-                    onJump = { rowIdx -> scope.launch { listState.animateScrollToItem(rowIdx) } },
-                    monthFmt = monthFmt,
-                    dayFmt = dayFmt,
-                )
-            }
-        }
-
-        Spacer(Modifier.width(2.dp))
-
-        // ── Photo grid with folder headers ────────────────────────────────
     LazyColumn(
         state = listState,
-            modifier = Modifier.weight(1f),
+        modifier = modifier.fillMaxSize(),
         contentPadding = PaddingValues(bottom = 32.dp),
     ) {
         items(
@@ -132,6 +98,7 @@ 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}-${item.dayDate}"
                     GridItemType.PHOTO_ROW -> "row-${item.rowPhotos!!.first().devicePath}"
                 }
             },
@@ -150,13 +117,33 @@ fun DensePhotoGrid(
                         onDeselectAll = { onDeselectAllFolder(section.allPhotos) },
                     )
                 }
-                    GridItemType.PHOTO_ROW -> {
+                GridItemType.DAY_BOUNDARY -> {
-                        val rowPhotos = item.rowPhotos!!
+                    // Thin rule with a small date label — scrolls with the grid
                     Row(
-                            modifier = Modifier.fillMaxWidth(),
+                        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),
                     ) {
-                            rowPhotos.forEach { photo ->
+                        item.rowPhotos!!.forEach { photo ->
                             DenseThumb(
                                 photo = photo,
                                 isSelected = photo in selectedPhotos,
@@ -166,7 +153,7 @@ fun DensePhotoGrid(
                                 modifier = Modifier.weight(1f),
                             )
                         }
-                            repeat(columnCount - rowPhotos.size) { Spacer(Modifier.weight(1f)) }
+                        repeat(columnCount - item.rowPhotos.size) { Spacer(Modifier.weight(1f)) }
                     }
                     Spacer(Modifier.height(2.dp))
                 }
@@ -174,62 +161,6 @@ fun DensePhotoGrid(
         }
     }
 }
-}
-
-/**
- * Scrubber overlay: proportionally-positioned date labels.
- * Uses a custom layout approach with fillMaxHeight + proportional offset.
- */
-@Composable
-private fun ScrubberOverlay(
-    scrubberDates: List<Pair<LocalDate, Int>>,
-    totalRows: Int,
-    onJump: (Int) -> Unit,
-    monthFmt: DateTimeFormatter,
-    dayFmt: DateTimeFormatter,
-) {
-    BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
-        val totalHeight = maxHeight
-
-        // Group by month — only show month label at first day of each month
-        var lastMonth: Int? = null
-
-        scrubberDates.forEach { (date, rowIdx) ->
-            val fraction = rowIdx.toFloat() / totalRows.toFloat()
-            val yOffset = totalHeight * fraction
-
-            val showMonth = date.monthValue != lastMonth
-            if (showMonth) lastMonth = date.monthValue
-
-            Column(
-                modifier = Modifier
-                    .offset(y = yOffset)
-                    .fillMaxWidth()
-                    .clickable { onJump(rowIdx) }
-                    .padding(vertical = 1.dp),
-                horizontalAlignment = Alignment.CenterHorizontally,
-            ) {
-                if (showMonth) {
-                    Text(
-                        monthFmt.format(date),
-                        fontSize = 8.sp,
-                        color = MaterialTheme.colorScheme.primary,
-                        textAlign = TextAlign.Center,
-                        lineHeight = 9.sp,
-                    )
-                }
-                Text(
-                    dayFmt.format(date),
-                    fontSize = 9.sp,
-                    fontWeight = if (showMonth) FontWeight.Bold else FontWeight.Normal,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    textAlign = TextAlign.Center,
-                    lineHeight = 10.sp,
-                )
-            }
-        }
-    }
-}
 
 @Composable
 private fun DenseThumb(
@@ -285,7 +216,6 @@ private fun DenseThumb(
             }
         }
 
-        // Video badge
         if (photo.mediaType == MediaType.VIDEO) {
             Badge(
                 containerColor = MaterialTheme.colorScheme.tertiary,
@@ -293,7 +223,6 @@ private fun DenseThumb(
             ) { Text("▶", style = MaterialTheme.typography.labelSmall) }
         }
 
-        // Selection indicator
         if (isSelected) {
             Icon(
                 Icons.Default.CheckCircle,

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

@@ -11,11 +11,12 @@ data class FolderSection(
 )
 
 /** Item types used in the DensePhotoGrid flat list */
-enum class GridItemType { FOLDER_HEADER, PHOTO_ROW }
+enum class GridItemType { FOLDER_HEADER, DAY_BOUNDARY, PHOTO_ROW }
 
 /** A single item in the DensePhotoGrid flat list */
 data class GridItem(
     val type: GridItemType,
     val folderSection: FolderSection? = null,
     val rowPhotos: List<PhonePhoto>? = null,
+    val dayDate: LocalDate? = null,
 )