Add WoW Midnight 12.0.1 support

[Timikana]

Summary

Adds WoW Midnight (12.0.1) compatibility via a new Core.lua file loaded only on retail. Classic/TBC/Wrath/Cata/Mists continue to load the original code unchanged — zero regression on any pre-Midnight client.

Philosophy

On Midnight, CLEU has intermittent taint issues and UNIT_COMBAT doesn't expose sourceGUID — making classic source filtering unreliable. Rather than fight this, Core.lua enhances Blizzard's native Floating Combat Text (which already filters perfectly to show only your damage) by providing font/CVar controls and (alpha) spell icons on nameplates.

Inspired by NiceDamage and MikScrollingBattleText.

Features (stable)

• Font selector with live preview (built-in + LibSharedMedia)
• Text scale, gravity, ramp duration, ramp power sliders
• Animation style dropdown: Scroll Up / Scroll Down / Arc
• Font Outline (Outline / Thick / Monochrome / None) + shadow
• Separate UI/SCT font option
• All FCT display toggles: Dodge/Parry/Miss, Spell Mechanics, Auras, Auto-attacks, Combo Points, Reactives, Damage Reduction, Low Mana/Health, Rep Changes, Honor Gains
• Standalone draggable options panel via /nsct + entry in WoW's AddOns settings menu
• French + English localization (auto-detect via GetLocale)
• /nsctdebug for diagnostics
• NiceDamage conflict detection (warns if both loaded — they fight over DAMAGE_TEXT_FONT)

⚠️ Alpha (not production-ready)

• Spell icons on nameplates (via UNIT_COMBAT + spell tracking) — works partially but has known limitations on Midnight. Disabled by default; can be enabled in /nsct > Alpha Function - Spell Icons section. Clearly labeled as alpha in the UI.
• The rest (fonts, CVars, toggles, panel) is stable and works.

Midnight API workarounds

• Secret values (spell IDs, GUIDs) — wrapped in pcall, never compared with == 0 directly, never used as table keys (tostring stays secret on Midnight)
• UNIT_COMBAT only processes nameplateX tokens (avoids party/raid rejections in GetNamePlateForUnit and target/nameplateX duplicates)
• Settings.RegisterCanvasLayoutCategory wrapped in pcall with standalone frame fallback
• MinimalSliderTemplate wrapped in pcall with bare slider fallback
• Font application at file parse, ADDON_LOADED, PLAYER_LOGIN, and PLAYER_ENTERING_WORLD (matching NiceDamage's timing) with path validation and LSM fallback

Files

• Core.lua (new, ~940 lines) — single-file Midnight code
• NameplateSCT.toc — loads Core.lua on retail (11.0 / 12.0)
• CHANGELOG.md (new)
• README.md — updated documentation

Classic TOC files (_Vanilla, _TBC, _Wrath, _Cata, _Mists), NameplateSCT.lua, Locales/, Libs/, and embeds.xml are not touched.

Test plan

• Loads on WoW Midnight 12.0.1 without errors
• /nsct opens options panel (standalone draggable frame)
• Font, scale, gravity, ramp duration — all working
• FCT display toggles apply immediately
• French localization works (fallback to English on other locales)
• /nsctdebug prints full diagnostic info
• Classic paths untouched — original TOCs still load original code
• Spell icons (alpha) — partial, disabled by default

[Justw8]

I have no interest in trying to support this with workarounds.
I'll keep my stance on updating it once Blizzard updates an api to modify combat texts (and not just your personal incoming information).

Feel free to use it for personal use. (leaving it open if others want to try, but it wont be merged.)