feat: scrollable chunk map dialog with player/island view modes

[tastybento]

Summary

• When territory can exceed the 13x13 dialog viewport (protection range > 104), a control row is added with two view-mode buttons:
  • ◎ Island center — viewport on island center, arrow points to player
  • ◆ Player position — viewport on the player's chunk, arrow points to island center
• The directional arrow shows 8 directions (▲▼◀▶↖↗↙↘) and is clickable to switch views. When the target is visible on-screen, the arrow is replaced by a dot.
• Small islands that fit in 13x13 behave exactly as before — no control row.
• Player-centered mode gracefully falls back to island-centered when the player isn't on the island.

Files changed

• ChunkMap.java — added viewport-center overload to cells(viewDx, viewDz)
• ChunksDialog.java — view mode enum, control row with mode toggles + directional arrow, viewport shifting
• en-US.yml — 4 new locale keys for view-mode button tooltips
• ChunksDialogTest.java — 7 new tests covering scrollable detection, viewport shifting, direction glyphs, fallback behavior

Test plan

• 750 tests pass (7 new)
• On test server with protection-range 240: open /ch chunks, verify control row appears, switch between Island/Player views, verify directional arrow
• On test server with protection-range 168: verify dialog shows without control row (small enough to fit)

🤖 Generated with Claude Code

https://claude.ai/code/session_01QWvvUY9ZZJHxUYm1UyjdwK

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
37.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud