Remove the last staging-panel language from tests

Generic range assertions and migrated commit tests should describe the views
they still exercise. Drop stale explorer wording so failures and test intent
no longer point contributors at UI that does not exist.

Co-Authored-By: GitHub Copilot <copilot@github.com>

pkg/integration/components/view_driver.go

@@ -239,7 +239,7 @@ func (self *ViewDriver) ContainsLines(matchers ...*TextMatcher) *ViewDriver {
 		expectedContent := expectedContentFromMatchers(matchers)
 
 		return false, fmt.Sprintf(
-			"Expected the following to be contained in the staging panel:\n-----\n%s\n-----\nBut got:\n-----\n%s\n-----\nSelected range: %d-%d",
+			"Expected the following lines to be contained in the selected range:\n-----\n%s\n-----\nBut got:\n-----\n%s\n-----\nSelected range: %d-%d",
 			expectedContent,
 			content,
 			startIdx,

pkg/integration/tests/commit/unstaged.go

@@ -53,7 +53,5 @@ var Unstaged = NewIntegrationTest(NewIntegrationTestArgs{
 			)
 
 		t.Views().Main().IsFocused()
-
-		// TODO: assert that the staging panel has been refreshed (it currently does not get correctly refreshed)
 	},
 })