fix: fix regression on multiItem input field when no item

[etiennejouan]

Context

Fix on 8904 issue (PR) introduces a regression when field has no item.
Background should be lighter.

Solution

Conditional styling, displayed only when MultiInput has item

[greptile-apps]

PR Summary

Fixed styling regression in multi-item input fields by implementing conditional background styling and consistent height across input components.

• Added hasItem prop to StyledCustomPhoneInputContainer to only show background styling when items are present
• Adjusted PhoneCountryPickerDropdownButton height from 30px to 32px for consistency with other inputs
• Added conditional styling in MultiItemBaseInput to only apply background/border when items exist
• Unified styling behavior across phone, email and domain name input fields

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[guillim]

LGTM

[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-60db998f.json

Generated by 🚫 dangerJS against cc02ff2