Add missing Pulumi IDP puzzle piece icon in navigation

[Copilot]

Issue Description

In the top navigation menu on pulumi.com, all product selections had their own icon except for Pulumi IDP, which was missing its puzzle piece icon.

Fix

Added the puzzle piece icon to the Pulumi IDP tab in the documentation top navigation by adding:

<img class="tab-icon" src="/icons/puzzle.svg" />

This restores the visual consistency in the navigation where each Pulumi product has its appropriate icon.

Fixes #15134.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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