Fixes #7101: drop the undeclared variant key from the dropdown-menu Delete item

[os-justin]

Fixes #7101

Ruling executed

Option A (director seat comment #7101 (comment), maintainer verbatim 「同意」, batch #28): the variant key leaves the Delete item in examples/schema-catalog/src/schemas/components-overlay-dropdown-menu/with-icons.json; the item keeps label / icon; MenuCommandItem gains NO variant (no change under packages/**); not a rider on any other PR.

What changed

One file, one key removed (plus the preceding line's trailing comma) — exactly the expected diff shape:

     {
       "label": "Delete",
-      "icon": "trash",
-      "variant": "destructive"
+      "icon": "trash"
     }

Mechanism verification (re-grep, per the ruling's execution constraints)

Grepped variant across all menu-item fixtures under examples/schema-catalog/src/schemas/ — the two components-overlay-dropdown-menu/*.json, components-overlay-context-menu/basic-context-menu.json, components-overlay-menubar/application-menubar.json, and components-form-command/command-menu.json:

components-overlay-dropdown-menu/with-icons.json:20:      "variant": "destructive"   (the only hit — this PR removes it)
components-overlay-context-menu/*.json                                                (zero hits)
components-overlay-menubar/*.json                                                     (zero hits)
components-form-command/*.json                                                        (zero hits)

Positive control — components-overlay-alert-dialog/*.json (buttons, where ButtonSchema declares variant) stays non-zero, confirming the grep is discriminating menu-item spelling from button spelling, not just returning zero everywhere:

basic-alert-dialog.json:13:      "variant": "outline"
basic-alert-dialog.json:18:      "variant": "destructive"
confirmation-dialog.json:8:    "variant": "outline"
confirmation-dialog.json:14:      "variant": "ghost"
confirmation-dialog.json:19:      "variant": "default"
custom-actions.json:8:    "variant": "default"
custom-actions.json:14:      "variant": "outline"
custom-actions.json:19:      "variant": "default"
destructive-action.json:8:    "variant": "destructive"
destructive-action.json:18:      "variant": "destructive"

Zero-beyond-line-20 for menu items + non-zero control ⇒ the mechanism assumption held.

Gates (HEAD 02bc828, base origin/main 4ce14f1)

Gate	Command	Exit
Schema-catalog tests	pnpm exec vitest run examples/schema-catalog/	0 — Test Files 28 passed (28), Tests 2075 passed (2075)
Changeset presence	node scripts/check-changeset-presence.mjs	0 — "No source or published contract of a released package changed in this range, so no changeset is owed." (examples/schema-catalog is unpublished; no changeset added)
Control bytes	node scripts/check-control-bytes.mjs	0 — scanned 6291 tracked text file(s)
JSON syntax	node -e "JSON.parse(...)"	0 — valid JSON

No check:* gate family targets JSON fixture content directly beyond the two run above; this is a JSON-only fixture edit (no packages/**, no TS/JS source), so no package typecheck/test is otherwise implicated.

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