[tui] Implement Settings Connected Accounts tab with disconnect flow #201
Description
Implement Settings Connected Accounts tab with disconnect flow
Type: feature
Domain: Codeplane TUI
Implement the Connected Accounts tab (tab 6) within the Settings screen. Features: scrollable list of connected OAuth accounts, each row showing provider name, provider icon/badge, connected email/username, and connection date, d to disconnect with confirmation dialog, optimistic removal with revert on error, empty state with 'Run codeplane auth connect ' hint, responsive layout. Tests in e2e/tui/settings.test.ts.
Dependencies: tui-settings-screen, tui-managed-list-with-actions, tui-settings-data-hooks
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