Fix preview dialog: scrollable + cap video height at 200dp

Dialog content is now scrollable so buttons are always reachable.
Video player capped at 200dp height — no longer pushes buttons
off screen when the JavaFX panel expands.

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

@@ -4,6 +4,8 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.rememberLazyListState
+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.material.icons.filled.Warning
@@ -408,7 +410,9 @@ private fun PhotoPreviewDialog(
 
     Dialog(onDismissRequest = onDismiss) {
         Card(modifier = Modifier.fillMaxWidth(0.85f)) {
-            Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+            Column(modifier = Modifier.padding(16.dp)
+                .verticalScroll(rememberScrollState()),
+                verticalArrangement = Arrangement.spacedBy(8.dp)) {
                 Row(verticalAlignment = Alignment.CenterVertically,
                     horizontalArrangement = Arrangement.SpaceBetween,
                     modifier = Modifier.fillMaxWidth()) {
@@ -461,7 +465,7 @@ private fun PhotoPreviewDialog(
                     Spacer(Modifier.height(2.dp))
                     LivePhotoPlayer(
                         videoPath = mov,
-                        modifier = Modifier.fillMaxWidth().aspectRatio(16f / 9f),
+                        modifier = Modifier.fillMaxWidth().height(200.dp),
                     )
                 } else if (photo.isLivePhotoStill && mov == null && movPath == null) {
                     Text("⏳ Loading motion clip…",