Fixes #336738 This makes the Agents window bottom panel configurable so it can remain full-span or align beneath chat without squeezing the side pane. ### Changes - Add a checkable **Align Panel with Chat** action to the existing panel overflow and persist the selected alignment per profile. - Reparent the existing Grid views while preserving panel height, side-pane width, focus, hidden views, and maximize/restore behavior. - Preserve hidden leaf and branch visibility in the shared Grid operations exercised by these transitions. - Keep the panel inset when the primary sidebar is collapsed, match native macOS lower-corner geometry, and retain the full-span layout on mobile. - Add focused Grid, layout-action, topology, sizing, and styling regression coverage. ### Validation - `npm run compile` — passed with 0 errors. - `./scripts/test.sh --run src/vs/base/test/browser/ui/grid/grid.test.ts --run src/vs/sessions/test/browser/workbench.test.ts --run src/vs/sessions/test/browser/layoutActions.test.ts` — passed, 172 tests. - `npm run typecheck-client` — passed. - Targeted ESLint for all changed TypeScript files — passed. - `npm run stylelint -- src/vs/sessions/browser/media/workbench.css` — passed. - `git diff --check` — passed. - Agents window Dev UI scenario PA-01 through PA-08 — passed, covering both alignments, existing-overflow placement, collapsed-sidebar spacing, native macOS corners, maximization restoration, hidden views, and sash regressions. ### UI validation **Chat-aligned panel**  **Full-span panel**  **Chat-aligned panel with the primary sidebar collapsed**  **Full-span panel after maximization and alignment restoration** 
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