Large map: explored border as a continuous line along the fog edge

The game drew 2x2 px red dots per visited-sector neighbour (0x6c8580), in
64-tile steps and unrelated to the explored mask. Replaced by lines traced
from the explored cells (2x2 tiles), simplified to 0.75 px, rebuilt while
the map is open when the masks change.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tools/names.txt

@@ -431,3 +431,9 @@
 0x005ff820 cObjectManager::ObjectsInRange     # thiscall (out, position, type, only, radius = -1: type sizes), ret 0x14
 0x00428bb0 TypeTable::ObjectSize              # thiscall (type), ret 4: +0x14, default 50
 0x004fc810 Creature_StunChance                # (level, creature): level * 5 / creature level * 100
+0x00633230 World_RebuildVisitedBorder        # thiscall: clears the 100x100 border bytes (+0xb73c) and runs 0x6332d0 for every sector with flag 0x20000 (visited); on load (0x471086, 0x60c621)
+0x006332d0 World_UpdateVisitedBorderAround   # thiscall (sector cx, cy), ret 8: border byte of each unvisited 3x3 neighbour (0x6334f0)
+0x006334f0 World_ComputeVisitedBorderCell    # thiscall (cx, cy), ret 8: 8 bits, one per neighbour sector with flag 0x20000
+0x006336b0 World_VisitedBorderCell           # thiscall (cx, cy), ret 8: border byte, 0 outside 100x100
+0x006c8580 cUI_Megamap::DrawVisitedBorder    # thiscall (device), ret 4: 2x2 px red (0xffff0000) dot per border bit, +-10/+-20 px from the sector origin
+0x006c87c0 cUI_Megamap::DrawQuestMarkers     # thiscall (device), ret 4: quest book entries (0xaaaf00)