Add unit tests for the key quantity input enforcing a minimum of 1 and a maximum equal to the available contract supply

[Chucks1093]

Summary

The key quantity input on the buy modal must reject values below 1 and above the creator's available supply. Unit tests should confirm inline validation errors appear for out-of-range values and the confirm button is disabled while the input is invalid.

Scope

• Test entering 0 shows 'Minimum quantity is 1'
• Test entering a negative number shows 'Minimum quantity is 1'
• Test entering a value above available supply shows 'Exceeds available supply'
• Test entering exactly the available supply passes validation
• Test the confirm button is disabled while any validation error is active

Acceptance Criteria

• 0 or negative shows minimum error
• Above available supply shows capacity error
• Exactly available supply passes validation
• Confirm button disabled while input is invalid
• No error shown for a valid quantity within range

ETA: 12 hours

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Coordinate on Telegram

[GazzyLee]

gm gm boss, I’d like to take on this issue by adding focused unit tests for the buy modal’s quantity validation. I’ll cover zero, negative, over-supply, exact-supply, and valid in-range values, while also verifying the appropriate inline error messages and that the confirm button remains disabled whenever validation fails. I’ll follow the project’s existing testing patterns and ensure the full test suite continues to pass.