Bring master 45d1196d3fe into the release/dsh-0.2.1 squash commit of #6247
so the release commit stays an ancestor of master.
Conflict resolutions:
- apps/web/tsconfig.json, tsconfig.host.json: keep the entry-customization
e2e and master's Computer Use e2e entries.
- docs/subsystems/slots.{md,zh.md}: keep both added paragraphs; re-record the
slots, ui-primitives, and ui-workspace README translation pairs.
- ui-sidebar SidebarRoot.tsx and locales.ts: keep the More menu imports and
copy next to master's version-copy toast.
- apps/web/tests/agent-preset-selection.e2e.ts: keep the New Session
blank-reuse assertions, read presets through master's
sessionProjections.checkpoint() instead of the deprecated stateOf().
Follow-ups on master's side:
- ui-sidebar sidebar-root spec: give master's version-copy render the entry
pin props that SidebarRootInjected now requires.
- snapshots/web/steering/trajectory.expected.md: add the More conversation
views trigger to master's new Trajectory golden.