SECRETS-90 Add environment support to overview

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Greptile Summary

This PR adds the ability to create environments directly from the overview page's environment selector dropdown. This is a UX improvement that prevents users from having to navigate to the settings page to add environments.

Key changes:

• Integrated AddEnvironmentModal into the environment dropdown with proper permission checks (ProjectPermissionActions.Create on ProjectPermissionSub.Environments)
• Added subscription limit validation to show upgrade prompt when environment limit is reached
• Fixed a critical React Hooks violation in useGetImportedSecretsAllEnvs where useCallback was being called inside a map function
• The fix ensures the sourceEnv is correctly passed through by restructuring the query function to return both data and env
• Adjusted spacing in CommandEmpty component for better visual consistency

The implementation follows existing patterns used in EnvironmentTabs and EnvironmentSection for permission checks and modal integration.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk - it adds new functionality without breaking existing features
• The changes are well-structured and follow existing patterns in the codebase. The React Hooks fix is important and correct. The only minor concern is the use of an undocumented alwaysRender prop on CommandSeparator, which may not have any effect but doesn't appear to cause runtime errors.
• No files require special attention - all changes are straightforward improvements

Important Files Changed

_{Last reviewed commit: e0cb95a}