Use magenta for missing (?) to distinguish from stale (✗ red)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryan-williams

src/dvx/cli/status.py

@@ -300,7 +300,7 @@ def status(targets, with_deps, jobs, verbose, as_json, no_transitive, as_yaml):
         status_style = {
             "fresh": ("✓", "green"),
             "stale": ("✗", "red"),
-            "missing": ("?", "red"),
+            "missing": ("?", "magenta"),
             "error": ("!", "red"),
             "transitive": ("⚠", "yellow"),
         }