feat(cli): merge @fusion/tui into fn dashboard with Ink TUI

Replace the legacy ANSI-based DashboardTUI with an Ink/React rewrite
under packages/cli/src/commands/dashboard-tui/, delete the standalone
@fusion/tui package, and make `fn` (no args) launch the dashboard.

The new TUI keeps the existing 5-panel status mode (system, logs,
utilities, stats, settings) but adds an interactive mode (b/a/g) with
three views: a kanban board with project picker and per-task detail,
an agents list+detail with state management, and a settings editor.
Bordered focus-aware panels, solid-background help overlay, static
all-blue FUSION splash that adapts to small terminals. DashboardTUI
and DashboardLogSink public API are unchanged so dashboard.ts only
needed import-path updates plus interactiveData/loadingStatus wiring.

Also adds zod to @fusion/dashboard to satisfy a peer dep introduced
by pi-coding-agent 0.70.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/contributing.md

@@ -32,7 +32,6 @@ pnpm build
 | `@fusion/core` | Shared domain types, stores, persistence, and core utilities |
 | `@fusion/dashboard` | Express API + React UI |
 | `@fusion/engine` | Scheduling, triage, execution, merge orchestration |
-| `@fusion/tui` | Ink-based terminal UI components |
 | `@fusion/desktop` | Electron shell around Fusion dashboard/client |
 | `@fusion/mobile` | Capacitor + PWA mobile packaging |
 | `@fusion/plugin-sdk` | Plugin SDK for building Fusion extensions |