Fix fog-of-war edge redraw crashes - #4

Summary

• Clip fogged-object redraws to the tactical view.
• Use the owning house’s color converter for fogged buildings instead of treating a map cell as a converter.

Prevents out-of-bounds rendering and CellClass memory corruption during fog-of-war redraws.

Behavior and compatibility

Bug fix; intended rendering behavior is preserved.

No other changes.

Validation

• VS2022 Win32 Debug and Release builds passed.
• Tests passed in both configurations.
• python manual/tools/manage.py check
• Release tested under Wine:
  Firestorm skirmish, G_CANYON.MAP, Fog of War enabled, AI present, unit movement and aggressive edge panning; no crash.
• Native Windows runtime testing was not performed yet!!

Documentation

manual/changes/fogged-object-edge-redraw.md.

Checklist

• The change is focused; unrelated mechanical cleanup is separate
• Compatibility effects and any migration are explicit
• Validation distinguishes what passed, failed, and was not run
• No prohibited assets, binaries, SDKs, credentials, or generated output are included