chore(spec): refresh the public API surface snapshot for DashboardWidgetOptions (#3588)

The api-surface gate reports 0 breaking, 2 added — the new
`DashboardWidgetOptionsSchema` const and its inferred `DashboardWidgetOptions`
type, both purely additive. Regenerated and committed as the gate asks.

Verified the whole spec generated-artifact set locally this time rather than one
gate per CI round-trip: check:docs, check:api-surface, check:skill-refs,
check:skill-docs, check:spec-changes, check:upgrade-guide, check:react-blocks —
all pass.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEZLBGyNoJMLvtGPqsMPRC

Author: claude

packages/spec/api-surface.json

@@ -3092,6 +3092,8 @@
     "DashboardNavItemSchema (const)",
     "DashboardSchema (const)",
     "DashboardWidget (type)",
+    "DashboardWidgetOptions (type)",
+    "DashboardWidgetOptionsSchema (const)",
     "DashboardWidgetSchema (const)",
     "Dataset (type)",
     "DatasetDimension (type)",