File edits are shown as raw args, not a diff with +/- coloring

[aasis21]

↻ Code moved — RTK refactor (#143). The mobile app was restructured into CORE (session/) / EDGE (session/runtime/ + services/) / SHELL (ui/ + app/). Behavior was preserved, so this finding still applies; line numbers in the body below are pre-refactor. Updated pointers:

• ToolCard.tsx → mobile/src/ui/thread/ToolCard.tsx

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Problem

For edit / create / str_replace tools, ToolCard.tsx shows the raw args + result string. There is no diff view (added/removed lines, hunks) — the single most important thing to review when an agent edits your code.

Why it matters

VS Code Copilot Chat and Codex/Claude Code render colored diffs (and per-hunk Keep/Undo). On a phone, a readable diff is how you decide whether to approve/trust an edit.

Suggested fix

Detect edit-type tools and render a syntax-aware unified diff (green/red), with the file path as a header.

References

• https://github.blog/ai-and-ml/github-copilot/copilot-ask-edit-and-agent-modes-what-they-do-and-when-to-use-them/
• https://authorityaitools.com/cookbooks/mastering-openai-codex-cli

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Filed from a UI research sweep of the Helm mobile app (landing + live demo session) using Playwright + full source review, cross-referenced against Claude, ChatGPT, GitHub Copilot Chat, and Codex/Claude Code UIs.

[aasis21]

Fixed in 232a085 (shipped to production + extension reinstalled). Validated: mobile tsc 0 / vitest 160, extension 52, shared 56, production build green.