Add CharacterDataEditDialog with text fields (name, concept, gender),
metatype dropdown (Human/Elf/Dwarf/Ork/Troll), number inputs (age,
nuyen, karma total/current), and decimal input for essence (0.0-6.0).
CharacterHeader card opens edit dialog on tap. All changes propagate
through CharacterViewModel immediately.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>