[Feature Request] Hide or disable /effort levels incompatible with current model

Bug Description
UX: Hide or disable /effort levels that don't apply to the current model When using /effort on Sonnet 4.6, the xhigh and max options appear in the menu with descriptions saying "Opus 4.7 only." This is confusing — it's unclear whether setting them has any effect, and the second /effort invocation silently cancelled without explanation. Suggestion: Grey out or hide effort levels that are incompatible with the active model, or show an inline warning before confirming the selection (e.g., "xhigh requires Opus 4.7 — switch models first?"). This would prevent users from thinking they've enabled deeper reasoning when they haven't.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.118
• Feedback ID: 2551507e-b5f6-404c-9c4a-7b159d7e9a43

Errors

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