fix: prevent interactions on locked dropdowns

[BitRevenant]

Summary

Fixes a critical issue where locked dropdowns could still be opened, selected values could be changed, and callbacks could be triggered.

Changes

• Use the shared Dropdown.Locked state instead of a stale copied boolean.
• Prevent locked dropdowns from opening.
• Prevent item selection and value changes while locked.
• Block callbacks when the dropdown is locked.
• Close the menu if the dropdown is locked while open.
• Handle delayed opening safely.

Testing

• Verified the final diff with git diff --check.
• Confirmed all internal factory calls use the updated signature.
• Locally compiled and tested. No regressions found and the fix works.

Closes #93

[Footagesus]

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