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/InitLevel.kt

@@ -17,6 +17,7 @@ internal fun initLevel(): Level = level(
     validator = repoPredicate { it.initialized },
     testCases = listOf(
         levelTestCase("plain init", "git init"),
+        levelTestCase("init current directory explicitly", "git init ."),
     ),
     setupChecks = listOf(
         levelSetupCheck(