RG-756: Add Mobile Viewport Browser Test Helpers

[menvil]

Summary

• Adds tests/Browser/Support/MobileViewports.php with named viewport constants
• Covers 375×812 (small mobile), 390×844 (mobile), 430×932 (large mobile), 768×1024 (tablet)
• Provides all() and mobileOnly() helpers for iterating viewports in browser tests

Test plan

• tests/Feature/Docs/Phase48MobileViewportHelperTest.php — existence and content test passes
• composer test passes (1550 tests)
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Adds tests/Browser/Support/MobileViewports.php to standardize mobile and tablet viewports in browser tests. Fulfills RG-756 with named constants and all() / mobileOnly() helpers; covers 375×812, 390×844, 430×932, and 768×1024, and includes a feature test.

^{Written for commit 11eae94. Summary will update on new commits.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 089cac1a-d99f-4a13-b8e3-8b3db8da0fae

📥 Commits

Reviewing files that changed from the base of the PR and between d7e7263 and 11eae94.

📒 Files selected for processing (2)

• tests/Browser/Support/MobileViewports.php
• tests/Feature/Docs/Phase48MobileViewportHelperTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/RG-756-add-mobile-viewport-browser-test-helpers

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