auto should use on-request approval policy

[johan456789]

The current approval policy "never" basically rejects any request that is not allowed by the sandbox. It should default to on-request just like what OpenAI's auto setting does so we can approve manually if needed.

OpenAI doc:

Key	Type / Values	Details
--full-auto	boolean	Shortcut for low-friction local work: sets --ask-for-approval on-request and --sandbox workspace-write.

Relevant code

Android:

litter/apps/android/app/src/main/java/com/litter/android/ui/LitterAppShell.kt

Lines 5549 to 5554 in df016c7

	AUTO(
	title = "Auto",
	description = "No prompts and workspace-write sandbox",
	approvalPolicy = "never",
	sandboxMode = "workspace-write",
	),

iOS:

litter/apps/ios/Sources/Litter/Views/ConversationView.swift

Lines 1851 to 1864 in df016c7

	var description: String {
	switch self {
	case .readOnly: return "Ask before commands and run in read-only sandbox"
	case .auto: return "No prompts and workspace-write sandbox"
	case .fullAccess: return "No prompts and danger-full-access sandbox"
	}
	}
	var approvalPolicy: String {
	switch self {
	case .readOnly: return "on-request"
	case .auto, .fullAccess: return "never"
	}
	}