RG-773: Add mobile UX documentation

[menvil]

Summary

• Add docs/mobile/mobile-ux-guidelines.md covering all Phase 48 patterns
• Documents: overflow prevention, tap targets, text wrapping, responsive display, drawer, breakpoints, testing
• 3 tests verify doc existence and key content

Test plan

• composer test passes

🤖 Generated with Claude Code

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Summary by cubic

Adds docs/mobile/mobile-ux-guidelines.md to codify Phase 48 mobile UX patterns (RG-773): overflow prevention, 40px tap targets, text wrapping, responsive labels, drawer behavior, and breakpoints. Adds tests that verify the doc exists and references min-w-0/overflow-hidden and the 40px requirement.

^{Written for commit 833f4a3. 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: 5fded1e5-dcc9-4b96-a03c-4760cda65620

📥 Commits

Reviewing files that changed from the base of the PR and between 032108c and 833f4a3.

📒 Files selected for processing (2)

• docs/mobile/mobile-ux-guidelines.md
• tests/Feature/Docs/Phase48MobileUxDocTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/RG-773-add-mobile-ux-documentation

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