Hooks-rules compliance, devtools, perf benchmarks, docs site overhaul

[oyvindberg]

Summary

Big multi-area branch. Highlights:

• Hooks correctness — comply with Rules of Hooks, eliminate stale closures, harden for concurrent rendering, extract closures into class instances to avoid per-render allocations
• Devtools — new `RemoteDataDevtools` fiber-scanning panel with shared-store deduplication and visible toggle button
• Performance — full benchmark harness (`bench/`), browser benchmark app, infinite-render tests, parametrized benchmark suite, perf docs with concrete numbers and crossover data
• Infinite scroll — new docs page and runnable snippet, pattern documented as supported
• React Compiler — verified 51/51 components pass react-compiler-healthcheck; docs softened to "designed to work with"
• Docs cleanup — full de-LLMification of `site/docs/**` (em-dashes 190 → 0, AI-tell vocabulary scrubbed, factual corrections like 51/54 component count)
• Landing page redesign — monochrome + orange palette, Geist Sans/Mono, mode-aware Prism themes, new `{T}` brace logo with light/dark variants and self-themed favicon
• CI — auto-deploy docs to GitHub Pages on master via `actions/deploy-pages`

Test plan

• CI green (build + tests)
• Docs deploy job runs on merge to master
• Spot-check landing page on https://oyvindberg.github.io/use-remote-data/ after merge
• Favicon themes correctly in light/dark OS modes