Previewable changed-file rows no longer show a redundant workspace chevron when the row already has an Open With control. The unified Workbench now owns the Browser entry point, and opening Browser mode creates a blank address bar instead of navigating to a hard-coded localhost port.
Constraint: Keep explicit preview links and localhost output cards able to open the browser directly with their target URL.
Rejected: Keep the top toolbar browser button | it duplicated the Workbench Browser tab and silently opened localhost:5173.
Rejected: Use localhost:5173 as the blank browser default | it makes arbitrary Browser mode look tied to a dev server.
Confidence: high
Scope-risk: moderate
Tested: cd desktop && /Users/nanmi/.cache/codex-runtimes/codex-primary-runtime/dependencies/node/bin/node ./node_modules/typescript/bin/tsc --noEmit
Tested: cd desktop && /Users/nanmi/.cache/codex-runtimes/codex-primary-runtime/dependencies/node/bin/node ./node_modules/vitest/vitest.mjs run src/components/chat/CurrentTurnChangeCard.test.tsx src/stores/browserPanelStore.test.ts src/components/browser/BrowserAddressBar.test.tsx src/components/workbench/WorkbenchPanel.test.tsx src/components/browser/BrowserSurface.test.tsx src/components/layout/TabBar.test.tsx --pool=forks --poolOptions.forks.singleFork=true
Tested: git diff --check -- desktop/src/components/chat/CurrentTurnChangeCard.tsx desktop/src/components/chat/CurrentTurnChangeCard.test.tsx desktop/src/components/browser/BrowserAddressBar.tsx desktop/src/components/browser/BrowserAddressBar.test.tsx desktop/src/components/browser/BrowserSurface.tsx desktop/src/components/browser/BrowserSurface.test.tsx desktop/src/components/layout/TabBar.tsx desktop/src/components/layout/TabBar.test.tsx desktop/src/components/workbench/WorkbenchPanel.tsx desktop/src/components/workbench/WorkbenchPanel.test.tsx desktop/src/stores/browserPanelStore.ts desktop/src/stores/browserPanelStore.test.ts
Not-tested: Full desktop check:desktop gate.
Routes preview://event (navigated/ready) from Rust into the browser store via a new subscribePreviewEvents subscriber; adds title field and setNavigated/setReady reducers to BrowserSessionState; BrowserSurface subscribes on mount to replace M1 optimistic nav-state.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Per-session in-app mini-browser state: current URL, back/forward
history stack (historyIndex with forward-truncation on navigate),
loading flag, and element-picker toggle.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
