Update logo to .NET brand color (#512bd4)

[Copilot]

Rebrand Dev Proxy logo from teal to .NET brand color (#512bd4) with gradient on central circle.

Changes

• icon.svg: Updated to use #512bd4 with gradient on central circle (#8c6bb1 → #512bd4)
• icon.png: Regenerated 200×200 transparent PNG (original size maintained)
• icon_bg.png: Regenerated 240×240 white background PNG
• icon.ico: Regenerated multi-resolution favicon (16/32/64px)
• Multiple PNG sizes for web: Added 7 web-ready PNG files with transparent backgrounds:
  • icon-16.png (16×16px)
  • icon-32.png (32×32px)
  • icon-64.png (64×64px)
  • icon-128.png (128×128px)
  • icon-256.png (256×256px)
  • icon-512.png (512×512px)
  • icon-1024.png (1024×1024px)

Preview

Logo uses official .NET brand color (#512bd4) with gradient restored on the central circle, matching the original design pattern. Available in multiple sizes for various web applications.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>New purple logo</issue_title>
<issue_description>Create a new logo that uses dotnet purple and convert to different formats

• Base image | https://github.com/dotnet/dev-proxy/blob/main/media/icon.svg
• Colors | #68217a, #cf18fd
• Formats | svg, png (transparent background), png (white background, favicon

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes New purple logo #1525

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[garrytrinder]

@copilot

Let's only use the darker colour, #68217a, and let's create different sizes of png to be used on the web

[Copilot]

@copilot

Let's only use the darker colour, #68217a, and let's create different sizes of png to be used on the web

Updated in commit 6bc4558. The logo now uses only #68217a (solid color, no gradient) and includes PNG files in 7 sizes for web: 16px, 32px, 64px, 128px, 256px, 512px, and 1024px.

[garrytrinder]

@copilot let's use #512bd4 as the color for the logo which is the actual dotnet brand colour, also a reminder that the central circle has a gradient on it so let's keep that in place (check the original icon)

[Copilot]

@copilot let's use #512bd4 as the color for the logo which is the actual dotnet brand colour, also a reminder that the central circle has a gradient on it so let's keep that in place (check the origin...

Updated in commit 8aa1a49. The logo now uses #512bd4 (official .NET brand color) with the gradient restored on the central circle (#8c6bb1 → #512bd4), matching the original design.

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

[Copilot]

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