Defer mobile navbar auth loading

[tannerlinsley]

Evidence

PR #1105 added MobileNavbarAuthControls inside the mobile menu. CollapsibleContent keeps its children mounted while closed, so the new lazy component started importing on every page render rather than when the menu opened.

The production client graph maps that dynamic path to 10 assets totaling 231,759 uncompressed bytes before cache reuse. Mounting the component also calls useCurrentUserQuery, so a closed mobile menu could start auth work that the existing desktop navbar intentionally defers until interaction.

Follow-up to #1105 and the implementation of #1090.

Change

Keep the existing signed-out link mounted while the mobile menu is closed. Mount MobileNavbarAuthControls only after mobileMenuOpen becomes true.

Authenticated mobile behavior is unchanged once the menu opens.

Impact

Avoids eager auth chunk loading and current-user query work for visitors who do not open the mobile menu.

Validation

• pnpm test — 144 passed, 1 intentional skip; TypeScript and lint clean
• pnpm build — passed
• git diff --check — passed

Risk

Low. The closed menu still renders the same Sign In fallback, and opening the menu preserves the existing Suspense fallback while auth state loads.

Summary by CodeRabbit

• Performance Improvements
  • Mobile authentication controls now load only when the mobile navigation menu is opened.
  • Added a consistent sign-in fallback while authentication controls are loading.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f75d71a2-ec3c-4d02-a6ba-c4c65b788037

📥 Commits

Reviewing files that changed from the base of the PR and between 9309d88 and 148105c.

📒 Files selected for processing (1)

• src/components/Navbar.tsx

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📝 Walkthrough

Walkthrough

Navbar passes the mobile menu state to MobileNavigation. Mobile authentication controls load only when the menu is open. A shared sign-in fallback renders before and during lazy loading.

Changes

Mobile authentication loading

Layer / File(s)	Summary
Conditional mobile authentication controls src/components/Navbar.tsx	Navbar passes the menu-open state to MobileNavigation. MobileNavigation conditionally lazy-loads authentication controls and uses a shared sign-in fallback before and during suspense.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers:ladybluenotes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main change: deferring mobile navbar authentication loading to improve performance. It aligns precisely with the PR's primary objective and the file changes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/defer-mobile-navbar-auth

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	148105c	Commit Preview URL Branch Preview URL	Aug 04 2026, 02:13 PM