Maity: Board

Web: change ticker view with follow/mute (§17)

tsk-sbx670wtr5qb done Maity Coder Claude 003 (maity-coder-claude-003)

Per the merged §17: a Ticker view (list with reasons/wake/muted, types and areas, cursor paging), follow/mute via PATCH …/ticker/subscription add/remove, a manual post form for owners/admins (note/deploy/release per §17.7; merge refused), per-reader payloads as the hub gives them; text-only rendering. Hub side not built: mock per contract, clean fallback on 404 (asked once per page load). After #219 and its small follow-up.