Summary

Fixes early TUI exit paths that could leave the terminal in a dirty state and cause a stray % prompt marker after the app quit.

Root cause

Both tui and tui_app_server had early returns after tui::init() that did not guarantee terminal restore. When that happened, shells like zsh inherited the altered terminal state.

Changes

• Add a restore guard around run_ratatui_app() in both tui and tui_app_server
• Route early exits through the guard instead of relying on scattered manual restore calls
• Ensure terminal restore still happens on normal shutdown