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>

packages/cli/src/bin.ts

@@ -210,6 +210,7 @@ const HELP = `
 fn — AI-orchestrated task board
 
 Usage:
+  fn                                  Launch the dashboard (same as fn dashboard)
   fn init [opts]                      Initialize a new fn project in the current directory
   fn dashboard                        Start the board web UI
   fn dashboard --paused               Start with automation paused
@@ -383,11 +384,18 @@ function getFlagValueNumber(args: string[], flag: string): number | undefined {
 async function main() {
   const { cleanedArgs: args, projectName } = extractGlobalProjectFlag(process.argv.slice(2));
 
-  if (args.length === 0 || args.includes("--help") || args.includes("-h")) {
+  if (args.includes("--help") || args.includes("-h")) {
     console.log(HELP);
     process.exit(0);
   }
 
+  if (args.length === 0) {
+    // No subcommand — launch dashboard on the default port.
+    const { runDashboard } = await import("./commands/dashboard.js");
+    await runDashboard(4040);
+    return;
+  }
+
   const command = args[0];
 
   const {