[tui] Implement Settings SSH Keys tab with add/delete/detail actions #198
Description
Implement Settings SSH Keys tab with add/delete/detail actions
Type: feature
Domain: Codeplane TUI
Implement the SSH Keys tab (tab 3) within the Settings screen. Features: scrollable key list sorted newest first, each row with title/type badge/fingerprint/date, Enter to toggle inline detail panel, a opens Add SSH Key modal overlay (Title + Key textarea), d opens delete confirmation bar, key type badges (Ed25519 in primary, others in muted), fingerprint truncation by breakpoint, modal form submission with Adding.../SSH key added feedback, 409 duplicate fingerprint handling, responsive column layout. Tests in e2e/tui/settings.test.ts.
Dependencies: tui-settings-screen, tui-managed-list-with-actions, tui-settings-data-hooks, tui-sync-toast-flash-system
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