feat(worldBuilder): add clearTileRange helper (#29)

[Rodrigoue9]

Title

feat(worldBuilder): add clearTileRange helper to purge batch draft tiles (#29)

Description

• Adds clearTileRange(mapNum, xMin, xMax, yMin, yMax, layer?) helper to worldBuilder.ts.
• Enables efficient rectangular area draft clearing and undo operations for the map editor.

Closes #29

[gitar-bot]

Code Review ✅ Approved

Adds the clearTileRange helper to worldBuilder.ts to enable efficient rectangular area draft clearing and undo operations for the map editor. No issues found.

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