[Kaloyanes]

Problem

The device panel always opens in 3D. Choosing Flat view in the toolbar was only kept in component state, so every reload, new tab, or newly opened device went back to 3D. For anyone who finds the 3D view uncomfortable, that means switching to Flat again each time.

Change

• New client setting deviceView ("3d" | "flat", default "3d", so nothing changes for anyone who never touches it) in packages/contracts/src/settings.ts.
• DeviceStreamView reads it instead of its local useState("phone"). The 3D view and Flat view toolbar buttons write it with updateClientSettings, the same way the diff layout toggle does. The last choice is remembered across reloads and shared by all devices.
• 3D still falls back to flat per device when it cannot run (Duo without hinge support, MJPEG, accessibility overlay, unsupported browser). That fallback does not overwrite the saved choice.
• docs/user/devices.md mentions that the last choice is remembered. There is no settings row: the toolbar is the only control.

Mobile has no 3D device view, so it is unaffected. This is a view preference, not an agent capability, so there is no MCP surface.

Scope and approval

Filed on my fork only (draft), not on pingdotgg/t3code. It is a small preference on an existing control, not a new feature: no new UI, one contract field with a default.

Verification

• vp run check:changed passes: format, lint, knip, typecheck (32 packages), and the 2 affected test files (the DesktopClientSettings fixture now carries deviceView, so persistence of the new key is covered there).
• Manual, in a real client: dev server in an isolated worktree, iPhone simulator streamed through the Device panel, Settings app open for neutral content. Before is main's DeviceStreamView.tsx temporarily restored in the same worktree.

Default (unchanged)	Before: pick Flat, reload	After: pick Flat, reload

• After the reload, Flat view reports aria-pressed=true and deviceView: "flat" is in the persisted client settings.

Not checked: iPhone Duo and Android foldable 3D, the desktop (Electron) shell, and a remote or relay connection. There is no automated test for the toolbar toggle itself; I judged a browser test not worth the mocking for a one-line state swap.

Written by Claude Sonnet 5.5 (claude-sonnet-5-5) in the Claude Code harness, run from T3 Code.

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