feat: show warning for unrecommended model selected in agent mode

[uinstinct]

Description

Show a warning below the text box when an unrecommended model is selected for agent mode.

• Model being suitable for agent mode is decided using the llm-info's recommendedFor field
• A "Know more" link to the issue points to https://docs.continue.dev/agent/model-setup
• Once the warning is dismissed, it is never shown again for any model

related to CON-2301

Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. Screen recordings are particularly helpful, and appreciated! ]

https://github.com/user-attachments/assets/3501a176-3128-4457-be00-275b3e28700b

Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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[RomneyDa]

@uinstinct closing for now because this will conflict with upcoming changes that add virtual tool calling capabilities for all models that doesn't support native tool calling, which will mostly nullify this approach.