docs: add Grid cross-references in layout and metric-card docs (#337)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

docs/components/layout.md

@@ -494,6 +494,7 @@ Add custom classes to individual columns:
 
 ## Related Components
 
+- [Grid](./grid.md) - Content-level grid for arranging items into columns
 - [DescriptionCard](./description-card.md) - Display data in columns
 - [Badge](./badge.md) - Status indicators
 - [SidebarLayout](./sidebar-layout.md) - App-level layout

docs/components/metric-card.md

@@ -71,6 +71,7 @@ import { MetricCard } from "@tailor-platform/app-shell";
 
 ## Related
 
+- [Grid](./grid.md) — Arrange MetricCards in responsive columns (e.g. KPI grids).
 - [Layout](./layout.md) — Page layout for placing MetricCards in a grid.
 - [DescriptionCard](./description-card.md) — Structured key-value cards for detail views.
 - [Badge](./badge.md) — Status badges that can complement metric displays.