Issues rendering codeblocks with some Pygments styles

Hello and thank you for your work!

I've noticed an issue with codeblock rendering when using non-native Pygments syntaxes.

Here is my config (streamdown version 0.33.0):

[features]
CodeSpaces = false
Clipboard  = true
Logging    = false
Timeout    = 10.0
Savebrace  = true

[style]
Margin          = 2 
ListIndent      = 2
PrettyPad       = true
PrettyBroken    = true
Width           = 0
HSV = [0.147, 0.137, 0.976]
Dark = { H = 1.2, S = 1.5, V = 1.1 }
Grey   = { H = 1.00, S = 1.15, V = 0.46 }
Mid    = { H = 1.57, S = 1.4, V = 0.84 }
Symbol = { H = 3.60, S = 3.60, V = 0.52 }
Head   = { H = 0.43, S = 3.50, V = 0.41 }
Bright = { H = 0.43, S = 3.60, V = 0.50 }
Syntax = "gruvbox-light"

Here is the command I'm running:

llm -f $XDG_CONFIG_HOME/llm/fragments/markdown-output.md "How do I update images when using nix's oci-containers? show me how to do this imperatively and with nix" | sd -c ~/Library/Application\ Support/streamdown/config.nongruv.toml

When I change it to anything but 'native' and 'solarized-light' syntaxes, the following issues show up:

• Codeblocks are rendered empty
• Codeblocks are missing some content (usually at the start of the block)
• Codeblocks are not a fixed width

I encountered this with gruvbox-light, perldoc, friendly and a number of others. All I changed in the config was the Syntax setting

Here's some example images:

Reproduce the issue with the provided streamdown command and compare the native, solarized-light, gruvbox-light, perldoc, and friendly Syntax settings. Trace the codeblock rendering and Pygments-style handling, then verify that each style preserves all content and renders codeblocks at a fixed width.