V263 - V258 BASE: SLOT-OWNER-ONLY CHARACTER UI + NORMAL BG2 EXPORT
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Base
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- Built directly from V258 fixed Player N -> Character Slot N isolation.

Character UI
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- In multiplayer, Character Record can open only for the local player's matching slot/account.
- The Character sidebar button is owner-gated.
- The Character screen pulse rejects hotkey/engine bypasses and returns a foreign Character Record to the world screen.
- Single-player Character Record behavior remains native.

Export
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- Restores BG2's stock Character Record Export button.
- Restores BG2's stock CHARACTER_EXPORT filename list, selection, editable filename, Done, and Cancel behavior.
- No custom DRAK_EXPORT_ROWS list or custom Done/Cancel handler is used by the Export panel.
- Existing account-folder filesystem routing remains in place, so native Export still writes through the logged-in account's routed character folder.

Preserved
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- V258 fixed slot ownership and no cross-portrait selection.
- V257 departed live-character Arbitration cleanup.
- No automatic character backups or standard Auto-Save rows.
