feat: Refactor TUI into modular structure and fix display issues

- Split TUI code into organized module structure (commands/tui/)
  - app.rs: Core application state and event handling
  - commands.rs: Command execution and HSM interaction
  - menu.rs: Menu categories and navigation
  - ui.rs: UI rendering and display formatting
  - mod.rs: Module exports and entry point

- Fix literal \n characters showing in TUI command output
- Update list-slots to display all slots with proper formatting
- Add comprehensive TUI testing infrastructure (15 unit tests)
- Create integration test framework for real HSM testing
- Make TUI navigation methods public for testing access
- Validate scrolling functionality with 18+ real HSM slots

All tests passing, TUI fully functional with real PKCS#11 data.
Modular architecture enables easier maintenance and testing.

Author: testingapisname

crates/rust-hsm-cli/src/commands/interactive.rs

@@ -12,12 +12,12 @@ pub mod analyze;
 pub mod common;
 pub mod crypto;
 pub mod info;
-pub mod interactive;
 pub mod key_wrap;
 pub mod keys;
 pub mod mac;
 pub mod symmetric;
 pub mod token;
+pub mod tui;
 pub mod util;
 
 use common::CommandContext;
@@ -358,7 +358,7 @@ pub fn dispatch_command(command: Commands, config: Config) -> Result<()> {
         // Interactive command
         Commands::Interactive { label } => {
             let token_label = ctx.token_label(label).ok();
-            interactive::run_interactive(ctx.config, token_label)
+            tui::run_interactive(ctx.config, token_label)
         }
     }
 }