Fix keyboard control

- restart has now focus after
  solving puzzle
- removed options can be added again
- removing a selection by keypress
  makes a rollback as well

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/end.kt

@@ -13,10 +13,14 @@ import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Alignment.Companion.CenterHorizontally
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.BlurEffect
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.platform.testTag
@@ -36,6 +40,12 @@ fun EndOfGame(
     time: String,
     onRestart: () -> Unit
 ) {
+    val focusRequester = remember { FocusRequester() }
+    LaunchedEffect(isSolved) {
+        if (isSolved) {
+            focusRequester.requestFocus()
+        }
+    }
     AnimatedVisibility(
         visible = isSolved,
         modifier = modifier,
@@ -72,6 +82,7 @@ fun EndOfGame(
                 Spacer(modifier = Modifier.height(32.dp))
                 Button(
                     modifier = Modifier.align(CenterHorizontally)
+                        .focusRequester(focusRequester)
                         .testTag("EndOfGame.restart"),
                     onClick = onRestart
                 ) {

commonUI/src/commonMain/kotlin/ch/dissem/yaep/ui/common/grid.kt

@@ -81,7 +81,7 @@ private fun PuzzleRow(
                     if (selection != null) {
                         when (e.key) {
                             Key.Spacebar, Key.Enter, Key.Delete, Key.Backspace -> {
-                                selection = null
+                                onSelectItem(row, cell, options, null, onSnapshot, onUndo)
                                 true
                             }
 
@@ -92,7 +92,11 @@ private fun PuzzleRow(
                         if (i != null && i in 1..options.size) {
                             val selectedItem = options[i - 1].item
                             if (e.isShiftPressed) {
-                                onOptionRemoved(row, cell, selectedItem, onSnapshot)
+                                if (cell.options.contains(selectedItem)) {
+                                    onOptionRemoved(row, cell, selectedItem, onSnapshot)
+                                } else {
+                                    cell.options.add(selectedItem)
+                                }
                             } else {
                                 onSelectItem(row, cell, options, selectedItem, onSnapshot, onUndo)
                             }