regenerate ui/component reference page on the merged tree

Discharges the os-regen deferral recorded by the merge commit. The page now
carries main's section-group-reference body and no longer opens with the
misattributed 'Empty Properties Schema' block, which is this branch's route-1
gate acting on the merged tree.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PBjwYLS6BciTQW3c9xQiD2

Author: claude

content/docs/references/ui/component.mdx

@@ -5,8 +5,6 @@ description: Component protocol schemas
 
 {/* ⚠️  AUTO-GENERATED — DO NOT EDIT. Run build-docs.ts to regenerate. Hand-written docs live in the module folders under content/docs/. */}
 
-Empty Properties Schema
-
 <Callout type="info">
 **Source:** `packages/spec/src/ui/component.zod.ts`
 </Callout>