Initial commit — ferrosonic terminal Subsonic client

Terminal-based Subsonic music client in Rust featuring bit-perfect audio
playback via PipeWire sample rate switching, gapless playback, MPRIS2
desktop integration, cava audio visualizer with theme-matched gradients,
13 built-in color themes with custom TOML theme support, mouse controls,
artist/album browser, playlist support, and play queue management.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/ui/mod.rs

@@ -0,0 +1,10 @@
+//! Terminal UI module
+
+pub mod footer;
+pub mod header;
+pub mod layout;
+pub mod pages;
+pub mod theme;
+pub mod widgets;
+
+pub use layout::draw;