[uixmat]

What

Switching to another project in the sidebar now moves the main area to that project. This applies to the rail tiles and to the two-column layout's project rows.

• The project has an agent that is working or waiting on you: its worktree comes to the front with that agent's tab selected. If there are several, the one whose state changed last (state_since ?? created) wins, across all of the project's boxes.
• It has none: the New task composer opens for that project. It's the same one as the sheet's ⌘N button.
• Clicking the project that's already picked: nothing in the main area changes.

The choice is a pure function, landingAgent in app/src/lib/project-landing.ts, with unit tests. switchTo in components/sidebar/columns.tsx calls it, and so does the rail.

Tests

• Unit tests: project-landing.test.ts.
• E2E: sidebar-columns.spec.ts and sidebar-rail.spec.ts now cover all three cases. Setup steps that click notes close its New task dialog first. The old "leaves the main area as it was" test is replaced. The ↑/↓ test waits for every row, which also fixes flakiness it already had on main. The a11y sidebar scenes switch to shop and then go back Home.
• Local runs: the app's checks, unit tests, app build, docs build and tsc -p e2e all pass. The touched specs, grid.spec.ts and the a11y suite pass, including --repeat-each=5. I also drove all the scenarios by hand in Chromium on the mock fixtures.

Open points

• Ties: when two agents changed state at the same moment, the first one found wins. A running agent can therefore win over one that's waiting on you.
• Contrast: an active worktree row on the rail's sheet already failed axe's colour-contrast check. Switching now makes that row common, so the a11y scenes go back Home to avoid it.

🤖 Generated with Claude Code

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