[MPDX-9595] Remove What's New link

[canac]

Description

Stakeholders are ready to remove the temporary What's New link from the navbar.

MPDX-9595

Testing

• Go to any page
• Check that the What's New link isn't in the navbar anymore

Checklist:

• I have given my PR a title with the format "MPDX-(JIRA#) (summary sentence max 80 chars)"
• I have applied the appropriate labels (Add the label "Preview" to automatically create a preview environment)
• I have run the Claude Code /pr-review command locally and fixed any relevant suggestions
• I have requested a review from another person on the project
• I have tested my changes in preview or in staging
• I have cleaned up my commit history

[github-actions]

Preview branch generated at https://9595-remove-whats-new-link.d3dytjb8adxkk5.amplifyapp.com

[github-actions]

Bundle sizes [mpdx-react]

Compared against 927da6b

No significant changes found

[canac]

Multi-Agent Code Review — VERDICT: CLEAN

Mode: quick (Architecture, Testing, Standards · sonnet)

Pure deletion PR (+0 −108): removes the env-var-gated "What's New" nav link across all 4 layers (next.config env passthrough → useNavPages → NavBar → NavItem/NavMenu) plus its tests and README docs.

Verification

• yarn lint:ts exits 0
• Zero remaining whatsNewLink / HELP_WHATS_NEW / What's New references in src/, pages/, README.md, next.config.ts
• No orphaned imports: useTranslation/t correctly dropped from NavMenu.tsx; correctly retained in NavItem.tsx and useNavPages.tsx where still used
• Only the dead-feature tests were removed — no collateral coverage loss for surviving behavior
• No breaking changes (feature was env-var gated, off by default)

Findings

0 blockers · 0 important · 0 medium · 1 informational

• (Informational, severity 1) The "What's New" i18n key is now orphaned in public/locales/** (24 files). This path is an excluded/low-risk path per .claude/rules/code-review.md; yarn extract + the next CrowdIn upload prunes it automatically. No action required.
• (Note, not a defect) .env.local still contains HELP_WHATS_NEW_* — gitignored, not in this PR; clean up locally if desired.

Risk

Mechanical risk score is 10/10 (CRITICAL), driven solely by next.config.ts matching a Critical-file pattern. The actual change to that file is the removal of two process.env passthrough lines — no CSP, header, rewrite, or image-domain change. Real risk: LOW. This is a textbook clean feature removal.

Agent	Crit	High	Imp	Sugg	Confidence
Architecture	0	0	0	1	High
Testing	0	0	0	0	High
Standards	0	0	0	0	High
Total	0	0	0	1

Ready to merge.

[github-actions]

AI Review Auto-Approval

Risk Level: LOW (2/10)
Verdict: CLEAN (no issues found)

This PR was auto-approved because:

• The multi-agent AI review determined it is low risk
• No blocking issues were found

If you believe this PR needs human review, dismiss this approval and request a review manually.