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/loop/server/loophttp.go b/loop/server/loophttp.go
index 8df1fc4..c1254e2 100644
--- a/loop/server/loophttp.go
+++ b/loop/server/loophttp.go
@@ -520,8 +520,8 @@
 			})
 			return
 		}
-		// Call the CancelInnerLoop method
-		agent.CancelInnerLoop(fmt.Errorf("%s", cancelReason))
+		// Call the CancelTurn method
+		agent.CancelTurn(fmt.Errorf("%s", cancelReason))
 		// Return a success response
 		w.Header().Set("Content-Type", "application/json")
 		json.NewEncoder(w).Encode(map[string]string{"status": "cancelled", "reason": cancelReason})