refactor: Implement StripAnsiFilter in streaming fashion using strip-ansi-escapes::Writer

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/filter_plugin/strip_ansi.rs

@@ -1,5 +1,5 @@
 use std::io::{Result, Read, Write};
-use strip_ansi_escapes::strip as strip_ansi_escapes;
+use strip_ansi_escapes::Writer;
 use crate::common::PIPESIZE;
 
 use super::FilterPlugin;
@@ -15,18 +15,16 @@ impl StripAnsiFilter {
 impl FilterPlugin for StripAnsiFilter {
     fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
         let mut buffer = vec![0; PIPESIZE];
-        let mut processed_data = Vec::new();
+        let mut ansi_writer = Writer::new(writer);
         
         loop {
             let bytes_read = reader.read(&mut buffer)?;
             if bytes_read == 0 {
                 break;
             }
-            processed_data.extend_from_slice(&buffer[..bytes_read]);
+            ansi_writer.write_all(&buffer[..bytes_read])?;
         }
-        
-        let stripped = strip_ansi_escapes(&processed_data);
-        writer.write_all(&stripped)?;
+        ansi_writer.flush()?;
         Ok(())
     }
 }