[P2] Inverse drift — renderers read undeclared props

[os-zhuang]

Part of the metadata liveness audit umbrella #1878 (P2 — spec hygiene, cluster #6).

Problem

Inverse drift: renderers depend on props the spec does not declare. These break a strict Schema.parse() — the renderer needs a key that a spec-validating author would never be allowed to write.

Checklist

• dashboard: component / data / rowField / columnField
• view: ObjectView form-adapter keys
• app: accentColor / badgeVariant / separator (also listed under naming drift)

For each: either add the prop to the spec (if it's legitimately authorable) or remove the renderer's dependency on it so strict validation holds.

Evidence

• docs/audits/README.md cluster Migrate from npm to pnpm #6
• docs/audits/2026-06-dashboardschema-property-liveness.md, 2026-06-viewschema-property-liveness.md, 2026-06-appschema-property-liveness.md