zlib TUI changes

Keep interactive CLI and shell entry points on shared models. profile uses profilePageModel; Kindle uses runStandaloneShellCommand for file selection, configuration, confirmation, password setup, and send results. Standalone pages exit to the terminal on return. Preserve JSON and non-interactive send behavior. Check TestStandaloneKindleSharesShellPages, TestStandaloneKindlePasswordAndResult, and TestStandaloneProfileMatchesShellPage when changing these flows.

Home has no search input or Enter-to-search hint. Open commands with /; ignore ordinary typing, paste, and Ctrl+K on idle home. Esc closes the command list and restores home without an input. Keep the signed-out login shortcut. Check TestShellHomeRequiresSlashForCommands when changing home input handling.