windows: Fix terminal inline assistant (#25715)

Closes #18518
Closes #20546

Release Notes:

- N/A

crates/assistant/src/terminal_inline_assistant.rs

@@ -1054,7 +1054,10 @@ pub enum CodegenEvent {
 
 impl EventEmitter<CodegenEvent> for Codegen {}
 
+#[cfg(not(target_os = "windows"))]
 const CLEAR_INPUT: &str = "\x15";
+#[cfg(target_os = "windows")]
+const CLEAR_INPUT: &str = "\x03";
 const CARRIAGE_RETURN: &str = "\x0d";
 
 struct TerminalTransaction {

crates/assistant2/src/terminal_codegen.rs

@@ -155,7 +155,10 @@ pub enum CodegenEvent {
     Finished,
 }
 
+#[cfg(not(target_os = "windows"))]
 pub const CLEAR_INPUT: &str = "\x15";
+#[cfg(target_os = "windows")]
+pub const CLEAR_INPUT: &str = "\x03";
 const CARRIAGE_RETURN: &str = "\x0d";
 
 struct TerminalTransaction {