Add App core struct with event-handling and initialization logic for TUI.

crates/owlen-tui/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "owlen-tui"
+version = "0.1.0"
+edition = "2021"
+description = "Terminal User Interface for OWLEN LLM client"
+
+[dependencies]
+owlen-core = { path = "../owlen-core" }
+
+# TUI framework
+ratatui = { workspace = true }
+crossterm = { workspace = true }
+
+# Async runtime
+tokio = { workspace = true }
+tokio-util = { workspace = true }
+futures-util = { workspace = true }
+
+# Utilities
+anyhow = { workspace = true }
+uuid = { workspace = true }
+
+[dev-dependencies]
+tokio-test = { workspace = true }
+tempfile = { workspace = true }