Cline 4.1.5: retired free-model notice and unified reasoning settings

Small follow-up release. Requests to a free model whose promotion has ended now get a specific notice with a model-picker button instead of a generic error, and reasoning effort and enable/disable toggles are mapped through one shared path across AI SDK providers.

Tool: cline · Version: v4.1.5 · Significance: 2/5 · feature, fix