Fix the invite / whisper functionality.

[RedAces]

What does this PR do?

I had weird bugs where I couldnt invite friends from the social plugin on the minimap. They just wouldnt get my invites. No chat message either like "Youve invited friend-realm to your party." Left clicking them showed that the realm was added multiple times: The whisper frame showed "To charname-realm-realm-..."

It fixed itself after awhile. IDK when or how.

How was it tested?

Tested on 12.1 retail infight and outfight.

Checklist

• New settings default OFF (no behavior change without opt-in)
• Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built
• Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• Tested in-game on live; no version gates or pre-Midnight APIs added