feat(gui): add ANSI escape sequence renderer with full panel integration

- new ansi_render module: SGR, cursor movement, erase, scroll
- integrate ANSI rendering into console panel output pipeline
- wire app_state, buffers, hex_view, and shortcuts for ANSI-aware display
- add test_ansi.py for manual ANSI sequence testing

crates/pipeview-gui/src/app_state.rs

@@ -3,9 +3,9 @@ use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
 
+use pipeview_client::config::SessionConfig;
 use serde::{Deserialize, Serialize};
 use tracing::warn;
-use pipeview_client::config::SessionConfig;
 
 const GUI_STATE_FILE_NAME: &str = "gui-state.json";
 
@@ -123,8 +123,8 @@ const fn default_true() -> bool {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::time::{SystemTime, UNIX_EPOCH};
     use pipeview_core::transport::TransportConfig;
+    use std::time::{SystemTime, UNIX_EPOCH};
 
     #[test]
     fn windows_gui_state_path_uses_appdata() {