anyrender_svg: don't apply text transform twice

[nicoburns]

Summary

SVG <text> was rendered with its transform applied twice, so text on e.g. shields.io badges (https://img.shields.io/crates/v/blitz.svg, which wraps text in <g transform="scale(.1)"> with font-size="110") ended up 100× too small and mispositioned (effectively invisible).

In render_group, each child's abs_transform() is pre-multiplied into transform before dispatch. The children of usvg::Text::flattened() already carry the text node's absolute transform, so the Node::Text branch must recurse with Affine::IDENTITY (as the Node::Group branch does), not with the accumulated transform:

 usvg::Node::Text(text) => {
-    render_group(scene, text.flattened(), transform, global_transform, error_handler);
+    render_group(scene, text.flattened(), Affine::IDENTITY, global_transform, error_handler);
 }

Verified via Blitz's screenshot example: badge text now renders identically to resvg's reference output.

Before / after (rendered by Blitz):

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/e3ee5d93814646ef9f657861d05792d9
Requested by: @nicoburns

[staging-devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR that start with 'DevinAI' or '@devin'.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment, CI, and merge conflict monitoring

[staging-devin-ai-integration]

Superseded by DioxusLabs/resvg#2, which reverts the usvg 0.48 behaviour change instead — with that revert, the existing anyrender_svg code is correct.