D&D (2024) 48 subclasses in the 2024 PHB: What are they?

[Marandahir]

I am familiar with the 4e Swordmage.

In 5e, I argue for a 100% Mage who spellcasts in melee combat. Any weapon attack is actually a spell, using the spellcasting ability, and inflicting a spell effect on the hit. Compare Paladin smite but with more spell effects.

So, the Bladesinger?