Click-casting: resolve spec-replacement spell overrides at macro build time

[doug-w]

Summary

• Fixes Click-cast macros use base spell name, breaking spec-replacement overrides (Nature's Cure, Cleanse Spirit, etc.) #63: click-cast macros for spec-replacement spells (e.g. Nature's Cure, Cleanse Spirit) silently failed because the macro contained the base spell name, which isn't in the replacement spec's spellbook.
• At macro-build time, distinguish proc-style overrides (e.g. Flash of Light → Benediction; base stays in book) from spec-replacement overrides (only override is in book) using C_SpellBook.IsSpellInSpellBook(..., includeOverrides=false). Resolve to the override name only in the spec-replacement case so proc behavior is preserved.
• ApplyBindings already runs on ACTIVE_PLAYER_SPECIALIZATION_CHANGED / TRAIT_CONFIG_UPDATED, so macros regenerate when the resolution would change.

Test plan

• Resto Druid: bind Nature's Cure → click-cast fires Nature's Cure (not Remove Corruption).
• Shaman with Cleanse Spirit talented: click-cast fires Cleanse Spirit.
• Holy Paladin: bind Flash of Light, trigger Infusion of Light → click still casts (proc resolves Flash of Light → Holy Light/Benediction); after proc expires, base name still works.
• Switch specs: macro regenerates and casts the correct spell for the new spec without re-binding.
• Non-localized client / non-English locale: macro still resolves to the correct localized name.

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