Move video overlay text to bottom with darker gradient

[ben-million]

Summary

• move overlay text from centered full-screen placement to a bottom-anchored overlay in video scenes
• render only a bottom overlay region that gradients upward and fades out
• extract shared overlay gradient generation into a utility
• darken overlay gradient alpha values for stronger contrast

Validation

• nr format packages/video/src/constants.ts packages/video/src/scenes/file-scan.tsx packages/video/src/scenes/diagnostics.tsx packages/video/src/utils/get-bottom-overlay-gradient.ts
• nr lint packages/video/src/constants.ts packages/video/src/scenes/file-scan.tsx packages/video/src/scenes/diagnostics.tsx packages/video/src/utils/get-bottom-overlay-gradient.ts
• nr build (in packages/video)

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Project	Deployment	Actions	Updated (UTC)
react-doctor-website	Ready	Preview, Comment	Feb 17, 2026 2:14pm