Fix Git editor reword workflow and UI coverage

- show Git editor file paths instead of the submitted git command
- surface follow-up commit message editors during interactive rebase reword
- add rename-commit UI tests for editor and amend-message solution paths
- add broader embedded level solution scenarios for alternate Git workflows

app/src/main/java/solutions/tretter/githugandroid/levels/CheckoutFileLevel.kt

@@ -24,5 +24,7 @@ internal fun checkoutFileLevel(): Level = level(
     validator = repoPredicate { repo -> repo.files.find { it.name == "config.rb" }?.content == "This is the initial config file" },
     testCases = listOf(
         levelTestCase("checkout file from head", "git checkout -- config.rb"),
+        levelTestCase("restore file from index", "git restore config.rb"),
+        levelTestCase("checkout file from explicit head", "git checkout HEAD -- config.rb"),
     ),
 )