feat(editor): IMPL_05 - Auto-scroll on line wrap in checklist editor

Changes:
- ChecklistItemRow.kt: Import mutableIntStateOf
- ChecklistItemRow.kt: Add onHeightChanged callback parameter
- ChecklistItemRow.kt: Track lastLineCount state for line wrap detection
- ChecklistItemRow.kt: Detect line count increase in onTextLayout and trigger callback
- NoteEditorScreen.kt: Add scrollToItemIndex state in ChecklistEditor
- NoteEditorScreen.kt: Add LaunchedEffect for auto-scroll on height change
- NoteEditorScreen.kt: Pass onHeightChanged callback to ChecklistItemRow

When typing in a checklist item at the bottom of the list, the editor now
automatically scrolls to keep the cursor visible when text wraps to a new line.

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/NoteEditorScreen.kt

@@ -338,6 +338,7 @@ private fun LazyItemScope.DraggableChecklistItem(
     onDelete: (String) -> Unit,
     onAddNewItemAfter: (String) -> Unit,
     onFocusHandled: () -> Unit,
+    onHeightChanged: () -> Unit,  // 🆕 v1.8.1 (IMPL_05)
 ) {
     val isDragging = dragDropState.draggingItemIndex == visualIndex
     val elevation by animateDpAsState(
@@ -363,6 +364,7 @@ private fun LazyItemScope.DraggableChecklistItem(
         isDragging = isDragging,
         isAnyItemDragging = dragDropState.draggingItemIndex != null,
         dragModifier = Modifier.dragContainer(dragDropState, visualIndex),
+        onHeightChanged = onHeightChanged,  // 🆕 v1.8.1 (IMPL_05)
         modifier = Modifier
             .then(if (!isDragging) Modifier.animateItem() else Modifier)
             .offset {
@@ -404,6 +406,9 @@ private fun ChecklistEditor(
         onMove = onMove
     )
 
+    // 🆕 v1.8.1 (IMPL_05): Auto-Scroll bei Zeilenumbruch
+    var scrollToItemIndex by remember { mutableStateOf<Int?>(null) }
+
     // 🆕 v1.8.0 (IMPL_017 + IMPL_020): Separator nur bei MANUAL und UNCHECKED_FIRST anzeigen
     val uncheckedCount = items.count { !it.isChecked }
     val checkedCount = items.count { it.isChecked }
@@ -418,6 +423,21 @@ private fun ChecklistEditor(
             dragDropState.separatorVisualIndex = separatorVisualIndex
         }
 
+        // 🆕 v1.8.1 (IMPL_05): Auto-Scroll wenn ein Item durch Zeilenumbruch wächst
+        LaunchedEffect(scrollToItemIndex) {
+            scrollToItemIndex?.let { index ->
+                delay(50)  // Warten bis Layout-Pass abgeschlossen
+                val lastVisibleIndex = listState.layoutInfo.visibleItemsInfo.lastOrNull()?.index ?: 0
+                if (index >= lastVisibleIndex - 1) {
+                    listState.animateScrollToItem(
+                        index = minOf(index + 1, items.size + if (showSeparator) 1 else 0),
+                        scrollOffset = 0
+                    )
+                }
+                scrollToItemIndex = null
+            }
+        }
+
         LazyColumn(
             state = listState,
             modifier = Modifier.weight(1f),
@@ -438,7 +458,8 @@ private fun ChecklistEditor(
                     onCheckedChange = onCheckedChange,
                     onDelete = onDelete,
                     onAddNewItemAfter = onAddNewItemAfter,
-                    onFocusHandled = onFocusHandled
+                    onFocusHandled = onFocusHandled,
+                    onHeightChanged = { scrollToItemIndex = index }  // 🆕 v1.8.1 (IMPL_05)
                 )
             }
 
@@ -466,7 +487,8 @@ private fun ChecklistEditor(
                         onCheckedChange = onCheckedChange,
                         onDelete = onDelete,
                         onAddNewItemAfter = onAddNewItemAfter,
-                        onFocusHandled = onFocusHandled
+                        onFocusHandled = onFocusHandled,
+                        onHeightChanged = { scrollToItemIndex = visualIndex }  // 🆕 v1.8.1 (IMPL_05)
                     )
                 }
             }

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/components/ChecklistItemRow.kt

@@ -25,6 +25,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
@@ -70,6 +71,7 @@ fun ChecklistItemRow(
     isDragging: Boolean = false,          // 🆕 v1.8.0: IMPL_023 - Drag state
     isAnyItemDragging: Boolean = false,   // 🆕 v1.8.0: IMPL_023 - Hide gradient during any drag
     dragModifier: Modifier = Modifier,    // 🆕 v1.8.0: IMPL_023 - Drag modifier for handle
+    onHeightChanged: (() -> Unit)? = null,  // 🆕 v1.8.1: IMPL_05 - Auto-scroll callback
     modifier: Modifier = Modifier
 ) {
     val focusRequester = remember { FocusRequester() }
@@ -91,6 +93,9 @@ fun ChecklistItemRow(
     // 🆕 v1.8.0: ScrollState für dynamischen Gradient
     val scrollState = rememberScrollState()
 
+    // 🆕 v1.8.1: IMPL_05 - Letzte Zeilenanzahl tracken für Auto-Scroll
+    var lastLineCount by remember { mutableIntStateOf(0) }
+
     // 🆕 v1.8.1: Gradient-Sichtbarkeit direkt berechnet (kein derivedStateOf)
     // derivedStateOf mit remember{} fängt showGradient als stale val — nie aktualisiert.
     val showGradient = hasOverflow && collapsedHeightDp != null && !isFocused && !isAnyItemDragging
@@ -216,8 +221,9 @@ fun ChecklistItemRow(
                     cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
                     onTextLayout = { textLayoutResult ->
                         // 🆕 v1.8.1: lineCount ist jetzt akkurat (maxLines=MAX_VALUE deckelt nicht)
+                        val lineCount = textLayoutResult.lineCount
                         if (!isAnyItemDragging) {
-                            val overflow = textLayoutResult.lineCount > COLLAPSED_MAX_LINES
+                            val overflow = lineCount > COLLAPSED_MAX_LINES
                             hasOverflow = overflow
                             // Höhe der ersten 5 Zeilen berechnen (einmalig)
                             if (overflow && collapsedHeightDp == null) {
@@ -230,6 +236,11 @@ fun ChecklistItemRow(
                                 collapsedHeightDp = null
                             }
                         }
+                        // 🆕 v1.8.1 (IMPL_05): Höhenänderung bei Zeilenumbruch melden
+                        if (isFocused && lineCount > lastLineCount && lastLineCount > 0) {
+                            onHeightChanged?.invoke()
+                        }
+                        lastLineCount = lineCount
                     },
                     decorationBox = { innerTextField ->
                         Box {