perf: drop globe texture preload hints from landing page

[alukach]

Part of #471.

What

Deletes the two <link rel="preload"> hints for the WebGL globe textures in src/app/(marketing)/page.tsx.

Why

The hints pulled 6.5 MB of textures into the critical window, ahead of the render-blocking stylesheet that gates first paint. On a real-throttled 4G profile, _next/static/css/1e5913857760d7aa.css was requested at 682 ms but did not arrive until 5901 ms — and FCP tracks that arrival exactly.

The preloads had no upside to weigh against that cost. The original comment said they warmed the cache "before the client component mounts", but LiveGlobe is dynamic(..., { ssr: false }) — it mounts after hydration and requests the textures itself either way. The preload only changed when the bytes competed for bandwidth, not whether they were fetched.

Measured impact

Lighthouse 13.4.1, mobile, --throttling-method=devtools:

Metric	Before	After
FCP	6.1 s	5.3 s
LCP	6.1 s	5.3 s
Blocking CSS arrives	5901 ms	5094 ms

Note that Lighthouse's default simulated throttling shows no change here — Lantern de-prioritizes Low-priority images out of the critical path and hides the contention. Re-measure with --throttling-method=devtools.

This is the first of several fixes; the textures are still oversized at 4096×2048, which #471 tracks separately.

Risk

Low. Deletes two JSX lines, no behavior change — the globe loads its own textures on mount as before.

Verification

• npm run type-check — 14 errors, identical to the count on clean main (all pre-existing, in analytics/ files)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
source-cooperative	Ready	Preview	Aug 3, 2026 4:27pm

[claude]

Claude finished @alukach's task in 1m 1s —— View job

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✅ No blocking issues — safe to merge.

• Verified the underlying claim: LiveGlobe fetches both assets itself regardless of the preload hints — globeImageUrl="/img/earth-blue-marble.jpg" in src/components/features/globe/LiveGlobe.tsx:536 and new TextureLoader().load("/img/clouds.png", ...) at LiveGlobe.tsx:163. Removing the two <link rel="preload"> tags in src/app/(marketing)/page.tsx:46-48 is purely a scheduling change, not a behavior change — matches the PR description.
• Diff is a pure deletion + comment update, no logic touched, no new failure modes introduced.