[tui] Implement Settings screen container with home summary dashboard #195
Description
Implement Settings screen container with home summary dashboard
Type: feature
Domain: Codeplane TUI
Implement the Settings screen as a full-screen view registered in the screen router. Features: settings tab container with 7 sections, Home section with 6 summary cards (Profile, Emails, SSH Keys, Tokens, Notifications, Connected Accounts), concurrent data fetching for summary cards, loading skeleton per card, inline error per card with R-to-retry, card navigation with j/k and Enter to navigate to section, responsive behavior at all breakpoints, deep-link support (--screen settings), command palette entry (:settings), and go-to keybinding registration. Implementation in apps/tui/src/screens/Settings/SettingsScreen.tsx and apps/tui/src/screens/Settings/SettingsHome.tsx. Tests in e2e/tui/settings.test.ts.
Dependencies: tui-settings-tab-container, tui-settings-data-hooks, tui-screen-router
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