[WOOMOB-3814] Restore default padding on JITM banner CTA button

[malinajirka]

Fixes WOOMOB-3814

The JITM banner's CTA button used a custom contentPadding that only set start, but Compose's PaddingValues constructor defaults every unspecified side to 0.dp — so it silently zeroed out top/end/bottom too. That collapsed the button's pressed/ripple Surface down to the exact size of the text, so the highlight had no padding on any side. Restoring ButtonDefaults.TextButtonContentPadding gives the ripple normal insets again.

Test Steps

1. Enable JITM testing mode: in developer.properties, set wc.jitm_testing_json_file_name=jitm_testing.json, then rebuild/install.
2. Open the "My store" dashboard — a JITM banner ("In-person card payments") should appear with a "Buy a card reader" CTA.
3. Press and hold the CTA button.
4. Confirm the pressed/ripple background forms a pill shape with padding around the text on all sides (not flush with the text).

Images/gif

N/A

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Build Number	778
	Version	25.4-rc-1
	Application ID	com.woocommerce.android.prealpha
	Commit	73f0918
	Installation URL	21h6i19ftkupo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[claude]

AI Code Review - No issues found. The changes look good.

This PR swaps a manual zero-start PaddingValues for the standard ButtonDefaults.TextButtonContentPadding on the JITM banner CTA TextButton, restoring Material3 default padding. The unused PaddingValues import is correctly removed and ButtonDefaults is imported. No correctness, security, or backwards-compatibility concerns.

PR housekeeping

• UI-only change: the restored default padding is visible on the JITM banner CTA button; no test plan required.

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[kidinov]

I think the change is good, but it requires some layout changes as well now