Add BoxRenderer component and refactor muxbox rendering

- Introduced `BoxRenderer` component to encapsulate muxbox rendering logic.
- Updated `draw_muxbox` function to utilize `BoxRenderer`, preserving existing functionality.
- Removed the old `render_muxbox` function, consolidating rendering logic within `BoxRenderer`.
- Added comprehensive tests for `BoxRenderer`, covering creation, rendering with content and choices streams, state preservation, and integration with scrollbars and PTY indicators.
- Updated module imports and test module structure to include new tests for `BoxRenderer`.

Author: jowharshamshiri

Cargo.toml

@@ -92,7 +92,7 @@ license = "MIT"
 name = "boxmux"
 readme = "README.md"
 repository = "https://github.com/jowharshamshiri/boxmux"
-version = "0.220.260260"
+version = "0.221.261016"
 
 [package.metadata.deb]
 assets = [["target/release/boxmux", "usr/bin/", "755"], ["README.md", "usr/share/doc/boxmux/README", "644"], ["examples/*", "usr/share/doc/boxmux/examples/", "644"]]

layouts/multi_stream_tabs_demo.yaml

@@ -1,4 +1,3 @@
-sd
 app:
   layouts:
     - id: "multi_stream_tabs_demo"