fix(desktop): add Copy Link action for chat links

[Klemencina]

What Changed

Adds a desktop-only Copy Link action to the native context menu for safe http/https links in chat output.

When right-clicking a chat link in the desktop app, the context menu now shows Copy Link, which copies the clicked URL to the clipboard.

Why

Fixes the missing link-copy action reported in #677.

This is intentionally narrower than #772. It only addresses the missing copy behavior and does not add Open Link or any other link actions.

UI Changes

Before:

• Right-clicking a chat link did not offer a link-copy action
  

After:

• Right-clicking a safe http/https chat link shows Copy Link
  

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add 'Copy Link' context menu action for chat links in the desktop app

Adds a 'Copy Link' item to the right-click context menu in main.ts when the clicked target has a URL that passes getSafeExternalUrl. The URL is written to the system clipboard using Electron's clipboard module, followed by a separator in the menu.

^{Macroscope summarized b003d3a.}

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[macroscopeapp]

Approvability

Verdict: Approved

Simple UI enhancement adding a "Copy Link" context menu option for links. The change is self-contained, follows existing patterns, uses existing URL validation, and only adds standard clipboard functionality with no security or behavioral concerns.

^{You can customize Macroscope's approvability policy. Learn more.}