- Add bottom-right status log panel with scrollable entries, word wrap,
mask clipping, and mouse wheel scrolling; cap at 60 entries
- Replace toast popups with announceStatus() for major events (war, tech,
first contact, city founded, trade routes, huts) — centered modal with
CONTINUE button that animates into the log; supports queued popups and
custom onDismiss callbacks (e.g. first contact opens diplomacy)
- Add smooth panToTile() tween for camera movement when selecting next unit,
refactored clampPan into panBounds() reused by both clamp and tween
- Add classic city sprite sheet (civilization-cities-classic.png) and
register it in artwork JSON and asset manifest
- Replace circular civ rings and selection ring with isometric ellipses
matching the 2:1 tile ratio for better depth reading
- Paint tile neighbors in ascending c+r order during repaintTileAndNeighbors
to prevent tall features from being overwritten by lower-sum neighbors
- Stop panTween on pointer down to avoid conflict with manual dragging
