Deepen ocean palette, add god-ray light shafts, split tagline lines

[Loyale]

Summary

• Deeper water column. Shifted the body gradient downward — the top of the page now sits in the upper mesopelagic rather than at the sunlit surface, and the bottom drops to true black. Overall noticeably darker while preserving the gradient feel.
• God rays. Layered radial gradients positioned just above the viewport produce narrow translucent columns of "god ray" light streaming down and fading as they descend, plus a diffuse surface glow band. With background-attachment: fixed, the rays stay overhead as the page scrolls — the viewer always feels below them.
• Tagline on two lines. BLOG_DESCRIPTION is split on sentence boundaries in base.tmpl and each sentence renders on its own line via a small CSS rule. The underlying config value stays clean plain text so RSS, meta tags, and other consumers are unaffected.

Test plan

• Hard-refresh the home page — confirm noticeably darker palette and visible streaks of light at the top fading toward the middle of the page
• Confirm the rays stay anchored to the viewport while scrolling (not the document)
• Confirm the header tagline displays "Dispatches from the neurogenic niche." and "Cells, sequences, and cephalopods." on separate lines
• Check that RSS / <meta name="description"> still contain the full single-line description (not the split markup)
• Spot-check a post page: article cards, code blocks, and links still have enough contrast against the darker background

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