Fix soft-keyboard level advance behavior

- Keep terminal focus without explicitly reopening the software keyboard after command field recreation.
- Preserve submitted-command IME echo suppression when advancing to the next level.
- Recreate the terminal input field when loading a level so stale editor state is discarded.

app/src/main/java/solutions/tretter/githugandroid/GitHugApp.kt

@@ -211,13 +211,19 @@ fun GitHugApp() {
             applyRecommendedPaneWeights(persist = false)
         }
 
-        fun loadLevel(index: Int, message: List<String> = listOf("Loaded level: ${levels[index].title}")) {
+        fun loadLevel(
+            index: Int,
+            message: List<String> = listOf("Loaded level: ${levels[index].title}"),
+            keepSuppressedImeEcho: Boolean = false,
+        ) {
             AppLog.d("GitHugApp", "Loading level index=$index id=${levels[index].id} title=${levels[index].title}")
             currentLevelIndex = index
             repo = runtime.prepareLevel(levels[index])
             output = message
-            clearCommandInput()
-            suppressedImeEcho = null
+            clearCommandInput(recreateField = true)
+            if (!keepSuppressedImeEcho) {
+                suppressedImeEcho = null
+            }
             hintIndex = 0
             activeExerciseDetail = null
             visibleHint = null
@@ -327,7 +333,7 @@ fun GitHugApp() {
                         "Level solved ${levelForResult.id}; advancing to next incomplete index=$nextLevelIndex id=$nextLevelId",
                     )
                     scope.launch { persistProgress(updatedCompletedLevels, nextLevelId) }
-                    loadLevel(nextLevelIndex, message = emptyList())
+                    loadLevel(nextLevelIndex, message = emptyList(), keepSuppressedImeEcho = true)
                 } else {
                     AppLog.d("GitHugApp", "All levels completed")
                     scope.launch { persistProgress(updatedCompletedLevels, levels.lastOrNull()?.id) }