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>

README.md

@@ -432,7 +432,6 @@ fn skills install firebase/agent-skills               # Install agent skills
 | `@fusion/core` | Domain model — tasks, board columns, SQLite store |
 | `@fusion/dashboard` | Web UI — Express server + kanban board with SSE |
 | `@fusion/engine` | AI engine — triage, execution, scheduling, workflow steps |
-| `@fusion/tui` | Terminal UI — Ink-based CLI components |
 | `@runfusion/fusion` | CLI + pi extension — published to npm |
 
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