[tui] Implement Settings Tokens tab with create/revoke/reveal flow #199
Description
Implement Settings Tokens tab with create/revoke/reveal flow
Type: feature
Domain: Codeplane TUI
Implement the Tokens tab (tab 4) within the Settings screen. Features: scrollable token list (newest first) with name/identifier/scopes/timestamp, two-line entries at standard+ (single-line at minimum), a opens create form with name input and scope multi-select checklist (10 scopes with Space toggle), Ctrl+S/Enter submits, token reveal panel with one-time display and success border, Enter/Esc dismisses reveal, d opens revoke confirmation, optimistic revoke with revert, state machine (loading→list→creating→revealing→list), admin scope handling. 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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