Why: U6 brings generated pages into the work view - a compact
task-page section renders the latest conversation surface under the
current-task card (SurfaceView), a pin freezes the shown page against
new arrivals (unpin follows latest), a jump button opens the full
preview, and the project-level aggregate loads on conversation open
for cross-session visibility; when the plugin is disabled or no pages
exist the section disappears and the work view is untouched.
Evidence: tsc clean; vitest 101/101 including the pin/follow test;
knip unchanged.
Impact: Frontend-only; consumes the U6 backend aggregate endpoint.
Refs: proposal r2 U6; Backend #163; Dev task feature/generative-ui-u6