Bump Mermaid renderer dependency

[zachlloyd]

Description

Bumps mermaid_to_svg to the latest merged warpdotdev/mermaid-to-svg main commit, which includes Mermaid frontmatter/config handling and the rasterizable SVG background change from PR 17.

Also updates Warp's Mermaid asset renderer to let mermaid-to-svg apply diagram-level frontmatter formatting directives instead of forcing the light theme at the call site. This preserves the default light rendering behavior while allowing supported per-diagram config like theme variables and font settings to take effect.

Adds a regression test that renders a Mermaid diagram containing frontmatter formatting directives and verifies the generated SVG includes the configured fill and font family.

Agent conversation: https://staging.warp.dev/conversation/43adc087-dbf8-47b2-a476-6981e71ad10c

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Related:

• Add rasterizable SVG background mermaid-to-svg#17
• Support Mermaid frontmatter config rendering mermaid-to-svg#15
• fix(mermaid): strip Mermaid frontmatter before rendering (#10676) #11249

Testing

• I have manually tested my changes locally with ./script/run
• ./script/format
• cargo clippy --workspace --all-targets --all-features --tests -- -D warnings
• cargo nextest run --no-fail-fast --workspace mermaid_asset_source_renders_frontmatter_formatting_directives

Screenshots / Videos

Not included; this PR is covered by a focused SVG-rendering regression test rather than screenshot comparison.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-IMPROVEMENT: Mermaid diagrams now tolerate and apply supported frontmatter formatting directives when rendered in Warp.

Co-Authored-By: Oz oz-agent@warp.dev

[oz-for-oss]

@zachlloyd

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Overview

This PR bumps the Mermaid renderer dependency, stops forcing the light theme at the Warp call site so diagram-level frontmatter can be applied, and adds a regression test for configured SVG fill and font output.

Concerns

• This changes user-visible Mermaid rendering behavior, but the PR description explicitly does not include screenshots or a screen recording. The repository review guidance requires visual evidence for user-facing changes, even when there is focused test coverage.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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⚠️ [IMPORTANT] This user-facing rendering change needs screenshots or a short screen recording demonstrating the new Mermaid frontmatter behavior end to end; the SVG regression test does not replace the repository's visual-evidence requirement.