feat(vault-tui): create/edit identities in the add/edit form (curated) #69

Job	Run time
headless build (no TUI / clipboard deps)	25s
cargo-audit	3m 7s
vault --version emits §13.2 attribution	34s
rustfmt	14s
test (macos-latest)	39s
test (ubuntu-latest)	34s
cargo-deny	40s
clippy	26s
	6m 39s

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