V264 - V263 base

Changes:
- Right-clicking an accessible party portrait opens that portrait character's Character Record panel instead of Inventory.
- Multiplayer foreign portraits remain non-clickable under the existing fixed Player N -> Character Slot N law.
- Character Record remains owner-only.
- Native BG2 Export behavior from V263 is unchanged.
- Existing no-cross-select, no-autosave, and no-backups behavior is unchanged.

Implementation:
- RIGHT_SIDEBAR actionAlt now calls drakOpenCharacterFromPortrait(0..5).
- drakOpenCharacterFromPortrait selects the portrait with Infinity_OnPortraitLClick(), then opens Character Record through the existing drakOpenOwnedCharacterUI() gate.
