Inherit the knowledge pipeline template icon when creating a knowledge base

The issue names no files or tests; start by tracing the Knowledge Pipeline template creation flow and the existing knowledge-base icon-editing UI. Confirm how the selected template icon and the knowledge-base icon are represented, then verify that creation uses the template icon while later manual icon changes remain possible.

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

When a knowledge base is created from a Knowledge Pipeline template, its icon currently falls back to the generic default knowledge-base icon instead of using the icon shown on the selected template.

For example, the Complex PDF with Images & Tables template has a distinctive PDF-related icon on the template selection page. After creating a knowledge base from that template, the resulting knowledge base displays the generic orange book icon.

This makes it harder to identify which template was used to build a knowledge base, especially when a workspace contains multiple knowledge bases created from different pipeline templates.

2. Additional context or comments

Expected behavior

• A knowledge base created from a Knowledge Pipeline template should initially inherit that template's icon.
• The inherited icon should only be the default at creation time.
• Users should still be able to change the knowledge base icon afterward through the existing icon-editing UI.

This would preserve visual context from the template selection flow and make template-based knowledge bases easier to recognize and manage.

3. Can you help us with this feature?

• I am interested in contributing to this feature.