Add copy action to environment variable values

[BunsDev]

Summary

• Adds a copy-to-clipboard button next to each environment variable value field.
• Shows a temporary copied state with a checkmark and updated tooltip after successful copy.
• Keeps copy and visibility controls grouped together for a cleaner editor header.

Testing

• Not run (PR content only).
• Verified by code inspection that the new copy action is disabled for empty values and readonly rows.
• Verified by code inspection that the copied state resets after 2 seconds.

[vercel]

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