Fix Chat/Imagine back navigation loops in TUI

[neednotapply]

Motivation

• Users were looped back into the same provider/model submenu when pressing Esc or selecting [Back] from the Chat model selector or the InvokeAI action menu instead of returning to the main menu.
• Make the top-level launcher and TUI flows behave predictably so a Back/escape action exits the flow rather than re-entering the same menu repeatedly.

Description

• Updated run_chat_mode to use the preferred-server helper (_choose_server_for_api) and changed the model-selection Back path to return so backing out goes to the main menu instead of re-entering the server/model loop.
• Updated run_image_mode and run_automatic1111_mode to return when the InvokeAI/Automatic1111 submenu returns [Back], preventing the submenu from looping.
• Added menu state helpers (_load_menu_state, _save_menu_state, _remember_server_selection, _forget_server_selection, _get_preferred_server, _choose_server_for_api) and wired them into server selection paths so preferred servers are reused and stale selections are cleared on failures.
• Adjusted the launcher (scripts/launcher.py) top-level options to dispatch TerminalAI.py with --mode overrides for chat, imagine, and configure to align launcher behavior with the main TUI.
• Added regression tests in tests/test_terminalai_modes.py that assert Back/escape from Chat model selection and InvokeAI submenus return to the main menu after a single cycle and that server-choice persistence behaves as expected.

Testing

• Ran pytest -q tests/test_terminalai_modes.py and observed 10 passed.
• Ran python -m py_compile scripts/TerminalAI.py scripts/launcher.py and the files compiled without syntax errors.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Distinguish back-out from missing server in chat flow

When _choose_server_for_api(..., allow_back=True) returns None, this branch always reports "No active Ollama servers available" even if the user simply pressed Esc/[Back] in select_server. Since _choose_server_for_api also returns None for a deliberate back action, the chat flow now shows a false error and extra confirmation prompt instead of quietly returning to the main menu; the same ambiguity also affects run_image_mode.

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