feat(web): redesign netrock.dev as a geological survey sheet

[fpindej]

Summary

• New visual language for netrock.dev: a geological survey sheet. Basalt background, chalk text, one warm iron accent, square corners, hairline rules. Bricolage Grotesque for display type, IBM Plex Sans/Mono for body and labels. No glow filters, blur, gradient blobs, traveling particles, or typewriter effect.
• Signature element: StrataColumn - the project rendered as layered rock, one layer per feature (hatch pattern per feature group), thickness proportional to the feature's share of generated files, updating live as features toggle. Shown on all three wizard steps.
• Header is a title block (strata mark, wordmark, rev x.y.z); wizard progress is a numbered sheet index (01 Name / 02 Stack / 03 Download).
• Landing: headline + project name field beside the column, questions as a hairline list. Stack: architecture selector, presets, dependency graph, feature cards restyled. Review: stats as a survey table row, file tree, setup commands restyled.
• FAQ, Why, Changelog pages restyled; changelog entries now render inline code.
• CLAUDE.md "Visual Standards" updated to describe the language; version 0.11.0 + changelog entry.

Not touched: favicons and og-preview.png are still the old cyan branding - regenerate separately.

Test plan

• pnpm test (120), pnpm build, pnpm --filter @netrock/web check (0 errors, 0 warnings), prettier clean
• Screenshots at 320, 390, 1280, 1440 for landing, stack (feature cards open, notes open), review, changelog, why: no horizontal overflow, 44px touch targets on mobile, column reorders above content on mobile
• Reduced motion respected (global rule + StrataColumn skips the deposition animation)