ImportScreen: scrollable content with pinned bottom button

- Body scrolls via verticalScroll
- Header and Start Import button stay fixed outside the scroll
- Summary card now shows source folder breakdown for multi-folder imports
- HorizontalDivider separates pinned button from scroll area

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

@@ -1,6 +1,8 @@
 package com.bolenpad.photophetch.ui
 
 import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.*
@@ -23,23 +25,51 @@ fun ImportScreen(state: AppState) {
         StagingPath.validateStagingRoot(Paths.get(config.stagingRoot))
     } else "Staging directory not configured"
 
-    Column(
+    val canImport = stagingError == null && importConfig.folderName.isNotBlank() && selected.isNotEmpty()
-        modifier = Modifier.fillMaxSize().padding(32.dp),
+
-        verticalArrangement = Arrangement.spacedBy(20.dp),
+    // Outer column: header + scrollable body + pinned button
+    Column(modifier = Modifier.fillMaxSize()) {
+
+        // ── Header (always visible) ──────────────────────────────────────────
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.padding(start = 4.dp, top = 8.dp, end = 16.dp, bottom = 4.dp),
         ) {
-        // Header
-        Row(verticalAlignment = Alignment.CenterVertically) {
             IconButton(onClick = { state.navigateTo(Screen.BROWSE) }) {
                 Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
             }
             Text("Import Configuration", style = MaterialTheme.typography.headlineSmall)
         }
 
-        // Summary
+        HorizontalDivider()
+
+        // ── Scrollable body ──────────────────────────────────────────────────
+        Column(
+            modifier = Modifier
+                .weight(1f)
+                .verticalScroll(rememberScrollState())
+                .padding(horizontal = 32.dp, vertical = 20.dp),
+            verticalArrangement = Arrangement.spacedBy(20.dp),
+        ) {
+            // Summary card
             Card {
-            Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                Column(
+                    modifier = Modifier.padding(16.dp),
+                    verticalArrangement = Arrangement.spacedBy(4.dp),
+                ) {
                     Text("${selected.size} files selected", fontWeight = FontWeight.SemiBold)
-                device?.let { Text("From: ${it.displayName}", style = MaterialTheme.typography.bodySmall) }
+                    device?.let {
+                        Text("From: ${it.displayName}", style = MaterialTheme.typography.bodySmall)
+                    }
+                    // Show source folders breakdown if multi-folder selection
+                    val folders = selected.map { it.sourceFolder }.distinct().sorted()
+                    if (folders.size > 1) {
+                        Text(
+                            "Folders: ${folders.joinToString(", ")}",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
                 }
             }
 
@@ -47,7 +77,10 @@ fun ImportScreen(state: AppState) {
 
             // Destination
             Text("Destination Folder", style = MaterialTheme.typography.titleSmall, fontWeight = FontWeight.SemiBold)
-        Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
                 Text(
                     "${config.stagingRoot}/",
                     style = MaterialTheme.typography.bodySmall,
@@ -62,7 +95,11 @@ fun ImportScreen(state: AppState) {
                 )
             }
             if (stagingError != null) {
-            Text(stagingError, color = MaterialTheme.colorScheme.error, style = MaterialTheme.typography.bodySmall)
+                Text(
+                    stagingError,
+                    color = MaterialTheme.colorScheme.error,
+                    style = MaterialTheme.typography.bodySmall,
+                )
             }
 
             HorizontalDivider()
@@ -72,7 +109,7 @@ fun ImportScreen(state: AppState) {
 
             ToggleRow(
                 label = "Convert HEIC → JPEG",
-            description = "Recommended for PhotoPhile on Linux. Uses macOS sips.",
+                description = "Recommended for PhotoPhile on Linux. Uses macOS sips (built-in).",
                 checked = importConfig.convertHeicToJpeg,
                 onCheckedChange = { state.updateImportConfig { copy(convertHeicToJpeg = it) } },
             )
@@ -84,7 +121,7 @@ fun ImportScreen(state: AppState) {
             )
             ToggleRow(
                 label = "Preserve folder structure",
-            description = "Files go into subfolders matching their source (e.g. Camera/, Screenshots/).",
+                description = "Files go into subfolders matching their source (Camera/, Screenshots/, etc.).",
                 checked = importConfig.preserveFolderStructure,
                 onCheckedChange = { state.updateImportConfig { copy(preserveFolderStructure = it) } },
             )
@@ -95,14 +132,23 @@ fun ImportScreen(state: AppState) {
                 onCheckedChange = { state.updateImportConfig { copy(deleteAfterVerify = it) } },
             )
 
-        Spacer(Modifier.weight(1f))
+            // Extra bottom padding so last item isn't flush against the button
+            Spacer(Modifier.height(8.dp))
+        }
 
+        // ── Pinned bottom button ─────────────────────────────────────────────
+        HorizontalDivider()
+        Box(modifier = Modifier.padding(horizontal = 32.dp, vertical = 16.dp)) {
             Button(
                 onClick = { state.startImport() },
-            enabled = stagingError == null && importConfig.folderName.isNotBlank() && selected.isNotEmpty(),
+                enabled = canImport,
                 modifier = Modifier.fillMaxWidth().height(52.dp),
             ) {
-            Text("Start Import (${selected.size} files)", style = MaterialTheme.typography.titleMedium)
+                Text(
+                    "Start Import (${selected.size} files)",
+                    style = MaterialTheme.typography.titleMedium,
+                )
+            }
         }
     }
 }
@@ -121,8 +167,11 @@ private fun ToggleRow(
     ) {
         Column(modifier = Modifier.weight(1f).padding(end = 8.dp)) {
             Text(label)
-            Text(description, style = MaterialTheme.typography.bodySmall,
+            Text(
-                color = MaterialTheme.colorScheme.onSurfaceVariant)
+                description,
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
         }
         Switch(checked = checked, onCheckedChange = onCheckedChange)
     }