[7oMB2006]

Problem

The Web MVP needs clearer conversation progress and connected inspection workflows. This first batch adapts DFSC presentation and interactions to the existing Web host and client.

Changes

• Conversation and Summary: render Markdown tables, retain observed thinking durations, group thinking and ordinary tools with inline disclosures, and show structured subagent states and read-only child transcripts. Add a shared right rail with Summary and Context views.
• File preview: recognize local file deliveries and open or toggle their Files preview, preserving tabs and rendered Markdown links.
• Browser and terminal: add authenticated host-owned Chromium and PTY adapters with bounded streams, reconnectable tabs and owned process cleanup.
• Performance: add a compact elapsed-time, throughput, token and cache row. Reveal disclosure arrows on hover or keyboard focus without moving labels.
• Account settings: separate Account from General, with four regional sign-in channels, credential status, safe optional UID and cancellation guards.

Behavior and compatibility

• Reuse existing coding-agent session, tool and permission semantics; the client does not implement another agent loop.
• Keep unknown historical timings and subagent statuses unknown. Summary task progress uses canonical task state, not tool-call counts.
• File references use existing workspace containment checks. Child transcripts remain read-only.
• Hiding an inspector keeps its tabs; closing a terminal tab cleans up its owned process tree. Browser support uses an installed engine without automatic downloads.
• Preserve cookie-only logout and read-only environment credentials. No balance or allowance UI is added.
• Update OpenAPI, bilingual labels, runtime documentation and third-party notices. Add pinned browser and terminal dependencies with the lockfile.

Validation

• Recorded final-head validation at effb182: pnpm run check passed on Windows with Git Bash as the script shell; 267 Web tests passed and 4 were skipped. The check includes types, guards, Web build and runtime/browser smoke.
• Feature validation records cover installed-Chromium and real-PowerShell adapters, file delivery projection, process groups, performance metrics and account flows. Responsive and light/dark UI checks were performed during development.
• git diff --check origin/feat/stepcode-web-mvp-gh...HEAD passed.
• The required ./test.sh result is not yet verified; it must not be reported as passed.

Limitations

• Pre-submission draft: merge simulation against MVP commit 91346ea reports a conflict in apps/web/client/src/ui/IconSprite/IconSprite.tsx. Resolve and revalidate before requesting merge.
• The current main CI workflow targets main, not this MVP base; full automatic CI coverage cannot be assumed.
• Linux/macOS native terminal behavior has not been verified. A client bundle-size advisory remains.