[tui] Implement Settings Emails tab with add/delete/primary/verify actions #197
Description
Implement Settings Emails tab with add/delete/primary/verify actions
Type: feature
Domain: Codeplane TUI
Implement the Emails tab (tab 2) within the Settings screen. Features: persistent add-email form at top with input, primary toggle, and Add button, scrollable email list with Primary/Verified/Unverified badges, j/k list navigation, a to focus add input, d to delete with inline y/N confirmation, p to set primary, v to send verification (with 15s cooldown), client-side validation (non-empty, contains @, 3-254 chars), max 10 emails cap, optimistic updates, responsive column 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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