Improve the UX/UI for chat settings and Replicate's embeddings

[Eyas Tayyem]

• Persist the chat settings' state in localStorage.
• Add tooltips where needed.
• Add conditional rendering depending on the selected chat provider:
• Display the relevant API key field based on the selected provider,
• Display an option to select whether to use chat context (embeddings) or not when Replicate is selected,
• Display the OpenAI API key field when both Replicate provider and chat context are selected,
• Chat context is enabled by default when using OpenAI.