fix(dashboard): replace env var browser guard with --open flag

Browser auto-open is now disabled by default. Users must pass --open
to open the dashboard URL in their browser. This prevents browser
windows from spawning during tests or CI without relying on env vars.

Upported from main branch's approach (cleaner than PWHEADLESS guard).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: robertDouglass

src/specify_cli/cli/commands/dashboard.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import os
 import webbrowser
 from typing import Optional
 
@@ -23,6 +22,11 @@ def dashboard(
         "--kill",
         help="Stop the running dashboard for this project and clear its metadata.",
     ),
+    open_browser: bool = typer.Option(
+        False,
+        "--open",
+        help="Open dashboard URL in your default browser (disabled by default).",
+    ),
 ) -> None:
     """Open or stop the Spec Kitty dashboard."""
     project_root = get_project_root_or_exit()
@@ -100,10 +104,7 @@ def dashboard(
     console.print("[cyan]" + "=" * 60 + "[/cyan]")
     console.print()
 
-    if os.environ.get("SPEC_KITTY_TEST_MODE") or os.environ.get("PWHEADLESS"):
-        console.print(f"[green]✅ Dashboard ready at:[/green] [cyan]{dashboard_url}[/cyan]")
-        console.print()
-    else:
+    if open_browser:
         try:
             webbrowser.open(dashboard_url)
             console.print("[green]✅ Opening dashboard in your browser...[/green]")
@@ -112,6 +113,10 @@ def dashboard(
             console.print("[yellow]⚠️  Could not automatically open browser[/yellow]")
             console.print(f"   Please open this URL manually: [cyan]{dashboard_url}[/cyan]")
             console.print()
+    else:
+        console.print("[dim]Browser auto-open is disabled by default.[/dim]")
+        console.print(f"[dim]Open manually: [cyan]{dashboard_url}[/cyan] (or use --open)[/dim]")
+        console.print()
 
 
 __all__ = ["dashboard"]