Refine Explore live experience

[aasis21]

WIClose: 807653

Summary

• move Explore into the active session shell and reuse the authoritative session drawer
• replace Agent Pulse/details with a fixed live Copilot dock that streams current reply text and returns attention actions to chat
• replace Discover filters/list/reader with a deterministic balanced daily swipe deck that persists progress without repeats
• fit Explore home, Watch, Play, and Unwind into fixed viewport bands with accessible overflow and short-phone scaling

Validation

• complete repository tests
• complete repository build and lint
• mobile test type-check
• strict OpenSpec validation
• focused Explore/App tests (22 passing)
• high-confidence review with all findings resolved

Privacy and safety

• the live dock only projects data already present in the active encrypted session
• Watch remains explicit-load, HTTPS-only, sandboxed, no-referrer, origin-validated, and receives no Weft context