Fix help callout anchoring and Push remote setup

- Anchor startup help callouts inside the scrollable pane workspace so they scroll with the exercise and terminal content they point at.
- Rebuild the Push level remote as a bare sibling repo with a temporary worktree for the remote-only commit, avoiding Android non-bare remote push failures.
- Leave a visible local worktree edit in Push while enabling rebase autostash so status, diff, and pull --rebase all behave as expected.
- Add native Push setup coverage for diverged status output, plain diff output, and clean pull --rebase behavior.

app/src/test/java/solutions/tretter/githugandroid/GitSandboxEngineTest.kt

@@ -175,6 +175,30 @@ class GitSandboxEngineTest {
         }
     }
 
+    @Test
+    fun nativePushLevelHasDivergedStatusAndRebasesCleanly() {
+        val git = File("/usr/bin/git")
+        assumeTrue(git.exists() && git.canExecute())
+        val root = Files.createTempDirectory("githug-push-level").toFile()
+        try {
+            val runtime = GitRepositoryRuntime(root, git)
+            val level = pushLevel()
+            val repo = runtime.prepareLevel(level)
+
+            val (_, statusOutput) = runtime.execute(level, repo, "git status")
+            assertTrue(statusOutput.any { it.contains("diverged", ignoreCase = true) })
+
+            val (_, diffOutput) = runtime.execute(level, repo, "git diff")
+            assertTrue(diffOutput.isNotEmpty())
+
+            val (rebasedRepo, pullOutput) = runtime.execute(level, repo, "git pull --rebase origin master")
+            assertFalse(pullOutput.any { it.contains("fatal:", ignoreCase = true) || it.contains("error:", ignoreCase = true) })
+            assertTrue(rebasedRepo.files.any { it.name == "file4" && it.tracked })
+        } finally {
+            root.deleteRecursively()
+        }
+    }
+
     @Test
     fun cdDotDotShortcutMovesToParentDirectory() {
         val repo = RepoState(initialized = true, currentDir = "src/main")