Rename cancelInnerLoop to cancelTurn to match refactored naming

- Updated all references to cancelInnerLoop and CancelInnerLoop
- Changed method and variable names to match the new processTurn naming
- Updated references in related files: server/loophttp.go and termui/termui.go

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/termui/termui.go b/termui/termui.go
index 14b91ad..6ff3e28 100644
--- a/termui/termui.go
+++ b/termui/termui.go
@@ -253,7 +253,7 @@
 			ui.AppendSystemMessage("\nšŸ‘‹ Goodbye!")
 			return nil
 		case "stop", "cancel", "abort":
-			ui.agent.CancelInnerLoop(fmt.Errorf("user canceled the operation"))
+			ui.agent.CancelTurn(fmt.Errorf("user canceled the operation"))
 		case "panic":
 			panic("user forced a panic")
 		default: