fix: adjust agent promotional banner UI to match design mocks

[MelvinBot]

Explanation of Change

Follow-up to #91251 addressing design review feedback on the AgentPromotionalBanner component:

• Button size: Use medium (regular) button on wide layout instead of small, matching the design mocks
• Subtitle text: Apply label font size (textLabel) to the subtitle text instead of the default body size
• Spacing: Reduce inner gap from gap4 (16px) to gap3 (12px) for tighter spacing around the button and dismiss icon

Fixed Issues

$ #91243

Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

• Verify that no errors appear in the JS console

Offline tests

No special offline test required — purely cosmetic changes.

QA Steps

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".
// Please describe what QA needs to do to validate your changes and what areas do they need to test for regressions.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
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• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
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  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
src/components/AgentPromotionalBanner.tsx	91.17% <84.61%> (-2.16%)	⬇️
... and 175 files with indirect coverage changes

[shubham1206agra]

Suggested change

	style={[styles.borderRadiusComponentLarge, styles.gap3]}
	style={[styles.borderRadiusComponentLarge]}

@MelvinBot No need for gap3 as it is already present in BillingBanner component

[MelvinBot]

Good catch — removed the redundant gap3. Pushed in 9dee2f2.

[shubham1206agra]

@dubielzyk-expensify The spacing cannot be reduced too much since we are using flexbox here. Do you have any other feedback here?

cc @NicolasBonet here

[dubielzyk-expensify]

Mostly just fixing the right part of the promo to use 20px padding from the right and 16px spacing between the X and the button:

[shubham1206agra]

@MelvinBot Address #91795 (comment)

[MelvinBot]

Addressed the spacing feedback in 111146c:

• The right padding was already 20px (ph5 on the BillingBanner container) — no change needed there.
• Increased the gap between the CTA button and the dismiss icon from 12px (gap3) to 16px (gap4) by bundling them into a single rightComponent wrapper with explicit gap4 spacing on wide layout.