Headline: the chat scroll rewrite lands. Ink 5.2 → 7.0.2 / React 18.3 → 19.2, the cell-diff renderer is retired, and reasonix code / reasonix chat default to alt-screen with row-precision virtual scroll. PgUp / PgDn / mouse wheel scroll history; an empty prompt + ↑ also scrolls (Ctrl+P / Ctrl+N still recalls prompt history). When scrolled away from bottom, the prompt hides and a 📖 reading history — End / PgDn to return hint appears. Resize-ghost dividers and <Static>-related scroll-yank artifacts are gone with the renderer that produced them. --no-alt-screen keeps the legacy in-shell-scrollback behavior.

web_search gains a configurable backend — Mojeek stays the default, but /web-search-engine searxng <url> switches to a self-hosted SearXNG instance for users whose network blocks Mojeek. And the MCP filesystem sandbox now fails with an actionable mkdir -p '<path>' hint instead of a raw Node stack when the configured directory doesn't exist; the wizard offers to create it inline at config time.

Features

• feat(ui): row-precision virtual scroll on Ink 7 + React 19 (PR #380) — <Static> retired (incompatible with alt-screen reflow); React.memo(CardRenderer) + reference-stable cards skip the reconciler on unchanged history. useChatScroll drives outer overflow=hidden + inner marginTop=-N slide; useBoxMetrics clamps bounds and auto-pins on new content. App owns PgUp/PgDn/End/wheel; PromptInput hands off ↑/↓ on empty buffer when pinned + idle. Ticker migrated to Ink 7's shared useAnimation.
• feat(web): configurable web_search backend with SearXNG support (PR #338) — /web-search-engine shows / switches the active engine; URL persisted to ~/.reasonix/config.json. Mojeek remains default; original Mojeek path preserved as searchMojeek(). Protocol auto-normalizes (localhost:8080 → http://...); unreachable SearXNG endpoint surfaces an install hint instead of a raw fetch error.

Bug fixes

• fix(mcp): preflight the filesystem sandbox directory (#362, PR #379) — missing dirs throw MCP filesystem sandbox '<path>' does not exist — create it with: mkdir -p '<path>' instead of a raw Node stack from inside npx's child. Wizard adds inline [Y] create / [N] enter different path confirm so bad config never reaches disk. Spawn-time path deliberately does not auto-mkdir — by then the user may not remember writing the config.
• fix(readme): website URLs corrected from /reasonix/ to /DeepSeek-Reasonix/ (PR #375).

Chores

• chore(issue-template): bug template asks for shell + terminal; model-id examples track current DeepSeek lineup (PR #378).

Install

```bash
npm install -g reasonix@0.30.3

or

bunx reasonix@0.30.3 code
```

Full Changelog: v0.30.2...v0.30.3