Add Mermaid diagram export actions

[marius-kilocode]

Add follow-up Mermaid diagram actions for copying and downloading rendered diagrams.

This ports the useful copy/export portions from community PR #9166 onto the current Kilo-specific Mermaid renderer, with labels translated across UI locales and without reviving the broader Solid island, zoom/pan modal, preview, or AI syntax-fix approach.

Current scope

• Add a compact Copy dropdown with Mermaid source, SVG, and PNG options.
• Add a compact Download dropdown with SVG and PNG options.
• Keep the renderer isolated in Kilo-specific UI helpers, with minimal shared Markdown hooks.
• Keep all Mermaid action labels translated across UI locale files.

Follow-up

Interactive zoom/pan is intentionally split out to #9894.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• packages/ui/src/kilocode/markdown-mermaid-actions.tsx
• packages/ui/src/kilocode/markdown-mermaid.css
• packages/ui/src/kilocode/markdown-mermaid.ts

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_{Reviewed by gpt-5.5-20260423 · 1,016,261 tokens}