Summary: Adds an option to suppress the AI “large prompt” warning/confirmation and applies it to Composer auto-compose flows.

Key changes:

• Introduces ResolvePromptOptions.suppressLargePromptWarning and threads it through AIProviderService.getPrompt → resolvePrompt
• Updates commit message + commit grouping actions to pass the suppression option when requested
• Composer webview tracks per-session suppression so the warning can be shown once, then skipped on subsequent actions

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