Fix incorrect gradient utility classes in Tailwind v4 migration

[Copilot]

The initial Tailwind v4 migration incorrectly changed gradient utilities from bg-gradient-to-* to bg-linear-to-*. Per the v4 upgrade guide, gradient utilities are unchanged from v3.

Changes

• Corrected 14 instances across 10 files: bg-linear-to-{direction} → bg-gradient-to-{direction}
• Affected directions: -l, -r, -t, -bl

// Before (incorrect)
<div className="bg-linear-to-l from-onruntime-blue/10 to-transparent" />

// After (correct)
<div className="bg-gradient-to-l from-onruntime-blue/10 to-transparent" />

Files modified: landing pages, service layouts, animated components, marketing screens

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Project	Deployment	Review	Updated (UTC)
onruntime-website	Ready	Preview, Comment	Dec 31, 2025 3:01pm

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