TUI: expand profile actions beyond init, backup, and check

[rmanibus]

Summary

The current TUI supports init, backup, and check on the selected profile.

We should decide which additional operations belong in the TUI and add them incrementally.

Scope

• Evaluate candidate actions such as list, restore, and other read-oriented operations
• Add a clear action area in the selection pane
• Support a default action via Enter
• Add refresh/help shortcuts such as r and ? if they fit the UX
• Keep destructive actions out unless we have a strong confirmation model

Why

• Makes the TUI more useful as an operator entry point
• Improves keyboard ergonomics
• Creates a path toward snapshot/file browsing from the TUI

Related: #132, #211, #213