Add mission run history nav + infinite scroll

[mlund01]

Summary

• New History tab on the mission detail page with a paginated list of that mission's runs; row click navigates to the run.
• Removed the top-right "N runs" button since the History tab covers it.
• Back button on a mission run now returns to wherever the user came from — either the mission detail page or the history list — using router location state.
• History view (/missions?view=history) now uses useInfiniteQuery with an IntersectionObserver sentinel for infinite scroll. Backend /history honors ?limit= and ?offset= (capped at 500).

Notes for reviewers

• Search on the history view remains client-side — it only filters runs already loaded. Server-side search isn't supported by the squadron-wire GetMissionsPayload protocol.
• To keep the shape split clean, history queries now use two keys: ['history', id] (plain useQuery, used by MissionDetail) and ['history-infinite', id] (MissionsPage). The runMission success path invalidates both.
• Navigation sites that open a run now pass state: { from: { kind: 'mission' | 'history', name? } }; the back button falls back to /instances/{id}/history when state is absent (direct link / hard refresh).

Test plan

• Open a mission with runs → History tab shows rows, pagination works, clicking a row opens the run.
• Back from run → mission detail (when opened from mission page).
• Back from run → history list (when opened from history view).
• History view scrolls and fetches more pages as you near the bottom.
• Starting a mission still refreshes both history queries.