Fix desktop chat markdown external links

[CodeZeno]

What Changed

• Route external markdown links in chat through the native desktop external-open path when running in Electron.
• Keep the regular web app on plain anchor behavior with no desktop-specific click interception.
• Limit the change to chat markdown external links only.

Why

In v0.0.8, clicking external links in chat did not work on Windows in the desktop app. I confirmed the broken behavior on Windows before this change and verified the fix there.

I have not confirmed whether macOS was affected, so this PR is intentionally scoped to the Windows-confirmed bug rather than claiming a broader regression.

This approach keeps the PR small and avoids changing browser behavior for the web build.

UI Changes

None. This is a behavior-only fix for external link handling in the desktop app.

Verification

• bun lint
• bun typecheck
• Manual verification on Windows desktop app

Checklist

• This PR is small and focused
• I explained what changed and why
• No visual UI changes, so screenshots are not applicable
• I included a video for animation/interaction changes

Note

Handle ChatMarkdown external link clicks in Electron by invoking readNativeApi().shell.openExternal in ChatMarkdown.tsx to fix desktop chat markdown external links

Add environment-aware anchor rendering in ChatMarkdown.tsx, importing isElectron and wiring onClick to readNativeApi().shell.openExternal(href) in Electron; keep _blank with rel='noreferrer' elsewhere.

📍Where to Start

Start with the markdownComponents.a renderer in ChatMarkdown.tsx.

^{Macroscope summarized e957bbe.}

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[CodeZeno]

Closing this since PR #599 already covers the same user-facing fix for external links in the desktop app.

I confirmed the broken behavior on Windows in v0.0.8, but after reviewing #599 it appears to address the same path centrally in Electron by routing external opens through the validated desktop shell.openExternal(...) flow.

My branch uses a narrower React-side fix in ChatMarkdown.tsx, but I don’t think it adds enough on top of #599 to justify a separate PR.

I have not confirmed whether macOS was affected.

Closing as redundant.