feat: added feature where space name is already in use it sugests a n…

[Prasad48432]

This PR improves the workspace creation UX by automatically suggesting an available slug when the user enters a slug that is already in use.

-- On slug input blur, the system checks if the entered slug has already been taken.
-- If it's taken, a new available slug is generated by appending a numeric suffix.
-- The first available slug is auto-filled back into the input field.
-- A toast message is shown to inform the user of the suggested alternative.

✅ Eliminates user frustration when chosen slugs are unavailable.

Fixes #1565

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​react-aria/​datepicker@​3.10.1 ⏵ 3.10.0
	@​react-stately/​datepicker@​3.9.4 ⏵ 3.9.3
	@​internationalized/​date@​3.5.4 ⏵ 3.5.3
	framer-motion@​10.18.0 ⏵ 10.16.16	+1			+1

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