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/buffers.rs

@@ -1,10 +1,10 @@
 use egui_plot::PlotBounds;
-use std::collections::VecDeque;
-use std::time::{Duration, Instant};
 use pipeview_client::RingBuffer;
 use pipeview_client::event::DecodedEntry;
 use pipeview_core::protocol::DecodedData;
 use pipeview_core::protocol::plot::{PlotFormat, PlotFrame};
+use std::collections::VecDeque;
+use std::time::{Duration, Instant};
 
 #[derive(Clone)]
 pub enum LineDirection {