docs: Added pin/unpin model to dock guide in Designer

content/en/kanvas/designer/pin-model-to-dock/index.md

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+---
+title: Pinning Models to the Dock
+description: Learn how to pin and remove models from the dock in the Kanvas Designer for quick access.
+weight: 12
+categories: [Designer]
+tags: [dock, pin, models]
+---
+
+# Pinning Models to the Dock
+
+The Kanvas Designer dock allows you to keep your most-used models and tools within easy reach. You can pin any model to the dock for quick access, and unpin it just as easily.
+
+## Overview
+
+Pinning a model adds it to the dock at the bottom of the Designer interface. This helps you:
+- Quickly access frequently used models
+- Customize your workspace
+- Streamline your design workflow
+
+## How to Pin a Model
+
+1. Hover over the model you want to pin in the component list.
+2. Click the **pin icon** that appears next to the model name. A tooltip will show "Pin To Dock".
+3. The model will now appear in the dock at the bottom of the Designer.
+
+![Pin To Dock action](./pin-to-dock.png)
+
+## How to Remove a Model from the Dock
+
+1. Hover over the pinned model in the dock.
+2. Click the **pin icon** again (the tooltip will show "Remove From Dock").
+3. The model will be removed from the dock.
+
+![Remove From Dock action](./remove-from-dock.png)
+
+{{< alert type="info" title="Good to Know" >}}
+You can pin as many models as your workflow needs and swap them out anytime as your project evolves.
+{{< /alert >}}