fix: keep TableMenu dialog input controlled

[mehmetyildizdev]

Description

• Ensure the TableMenu dialog TextInput is always controlled by initializing count as an empty string and resetting it when the dialog opens/closes.
• Silences the React controlled/uncontrolled warning and keeps the dialog input consistent.

What to review

• Open the Table menu, trigger each “Add …” action, and confirm the dialog input remains editable without console warnings.
• Double-check the confirm handler still submits the entered value correctly.

Testing

• Manually tested by opening each dialog, typing values, cancelling, and confirming to verify no warnings and correct behavior.