fix(Scripts/Northrend): improve EoE encounter visuals

[sogladev]

Changes Proposed:

This PR proposes changes to:

• Core (units, players, creatures, game systems).
• Scripts (bosses, spell scripts, creature scripts).
• Database (SAI, creatures, etc).

Update and fix the teleport visual spell

Set NPC flags of Hover Disk. Hover Disk spawns as an enemy + unselectable.

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[Copilot]

Pull request overview

Updates Eye of Eternity (Malygos) encounter scripting and DB data to improve spawn/teleport visuals and make Hover Disks behave correctly for players during Phase 2.

Changes:

• Updated the teleport visual spell ID used by EoE trash spawns.
• Deferred teleport visual casting via scheduler for Nexus Lords and Scions; adjusted Hover Disk / Wyrmrest Skytalon animation tier and disk interaction state on dismount.
• Added a pending world DB update to adjust Hover Disk creature_template faction/npcflag/unit_flags.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/server/scripts/Northrend/Nexus/EyeOfEternity/eye_of_eternity.h	Switches the spell ID used for the teleport visual.
src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp	Schedules teleport visuals on spawn; tweaks vehicle visuals and Hover Disk state after passengers disembark.
data/sql/updates/pending_db_world/rev_1774496999317065090.sql	Updates Hover Disk template flags to support intended interaction/visibility behavior.

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[Copilot]

This UPDATE overwrites creature_template.unit_flags with only UNIT_FLAG_NOT_SELECTABLE (33554432). In the base world DB, entry 30248 currently has unit_flags = 2 (UNIT_FLAG_NON_ATTACKABLE), so this change would drop that bit and potentially make the disk damageable (e.g., by AoE) while it is still hostile. Consider preserving existing bits (e.g., unit_flags = unit_flags | 33554432) or explicitly setting the combined value (e.g., include UNIT_FLAG_NON_ATTACKABLE) if the disk must remain unattackable.

Suggested change

	UPDATE `creature_template` SET `faction` = 14, `npcflag` = 16777216, `unit_flags` = 33554432 WHERE (`entry` = 30248);
	UPDATE `creature_template` SET `faction` = 14, `npcflag` = 16777216, `unit_flags` = `unit_flags` | 33554432 WHERE (`entry` = 30248);