Fix mobile overlay not closing on navigation link clicks

[Copilot]

The mobile overlay remained open after clicking navigation links because only the Playground link had an onClick handler. Navigation without closing the overlay creates poor UX.

Changes:

• Added onClick=toggleMobileOverlay to in-app links (Blog, Community, Packages)
• Added onClick=closeMobileOverlay to external links (X, Bluesky, GitHub, Forum)

// Before
<Link to=#"/blog" className={...}>
  {React.string("Blog")}
</Link>

// After
<Link to=#"/blog" className={...} onClick=toggleMobileOverlay>
  {React.string("Blog")}
</Link>

External links use closeMobileOverlay instead of toggleMobileOverlay since they navigate away from the app.

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