feat(aurabuffreminders): add grow direction option (centered/left/right)

[scavienger]

What does this PR do?

Adds a Grow Direction setting to AuraBuff Reminders (EllesmereUIAuraBuffReminders), allowing players to choose how the reminder row expands when buffs appear or disappear:

• Grow Right: Anchors the left edge in place, growing rightward. When buffs are consumed/applied or expire, icons on the left stay in place, preventing cursor misclicks.
• Grow Centered (Default): Expands symmetrically from the center (100% preserves existing behavior).
• Grow Left: Anchors the right edge in place, growing leftward.

Key details:

• Unlock Mode Integration: Fully synchronized with the Unlock Mode mover arrows and dropdown. Switching directions or moving anchors maintains visual position without coordinate jumping or drift.
• Options & Preview: Added Grow Direction dropdown to Display settings (and the inline Layout Settings cog), complete with an explanatory tooltip on the label. Preview box updates live.
• Localization: Added Korean (koKR.lua) localization matching existing EllesmereUI terminology and conventions.
• Code Style: Pure ASCII in all core Lua files, follows W:DualRow specs with { type = "label", text = "" } for trailing slot.

How was it tested?

• Client: Tested on live WoW client.
• In-Game Functionality:
  • Configured missing and active reminders (food, flasks, weapon enchants, raid buffs).
  • Toggled between Grow Centered, Grow Left, and Grow Right: verified the layout aligns to the center, right, and left respectively, matching the dropdown order in both options and Unlock Mode.
  • Consumed buffs while set to Grow Right: confirmed the left edge stays anchored and remaining icons do not shift unexpectedly.
  • Tested Unlock Mode mover: moved frame, dragged anchors, and changed directions via mover dropdown/arrows. Verified /reload preserves saved positions without reverting to center.
  • Verified the explanatory tooltip triggers cleanly on the "Grow Direction" text label and does not appear redundantly over the dropdown button itself.
• Localization: Added Korean translation in koKR.lua for the new setting and tooltip, and verified proper display on a koKR client.

Screenshots

Checklist

• New settings default OFF (no behavior change without opt-in) (Defaults to "Grow Centered", preserving existing behavior)
• 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