fix: improve TUI markdown rendering

[jy-tan]

Summary

Improve agent message rendering in the setup UI by adding Markdown-based formatting in TUI, avoiding headless Markdown rendering overhead, and preventing broken mailto: artifacts for emails and Git remotes.

Changes

• add shared renderAgentMessage helper for rendering agent text with Markdown in TUI
• sanitize scp-style Git remotes and plain emails before rendering to prevent mailto: autolink artifacts
• add regression tests to verify rendered output does not include mailto: for those patterns
• keep headless mode plain/wrapped text only (no glamour rendering) for predictable low-overhead output
• update Markdown link styling to use Tusk theme accent color (styles.PrimaryColor) with underline so links are readable in both dark and light backgrounds

[cubic-dev-ai]

1 issue found across 5 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="internal/agent/markdown_render.go">

<violation number="1" location="internal/agent/markdown_render.go:24">
P2: Fallback wrapping uses the markdown-sanitized string, so headless/plain output can contain literal backticks. Preserve and wrap the original input text in the fallback path.</violation>
</file>

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