Restore Copy Link in chat link context menu

[caezium]

What Changed

• Added Copy Link to the native context menu for HTTP(S) links in chat messages.
• Reused the existing clipboard helper and markdown action error reporting.
• Preserved the existing integrated-browser and system-browser actions.
• Left fragment and non-HTTP links on the normal browser context-menu path.
• Added focused tests for menu selection, cancellation, URL classification, and failures.

Why

The renderer-owned chat link menu replaced Electron's native link menu but omitted its copy action, so there was no way to copy a link without opening it.

Fixes #4155.

UI Changes

Before

After

Interaction

Watch the six-second interaction video

The screenshots and video were captured from an actual authenticated T3 Code Dev build using an isolated test home and neutral example.com content.

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

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Note

Low Risk
Localized chat UI refactor with injected clipboard/shell APIs and tests; no auth or data-layer changes.

Overview
Restores Copy Link on right-click for HTTP(S) links in chat markdown by moving the custom context menu into externalLinkContextMenu.ts and wiring Copy Link through writeTextToClipboard.

The menu still offers open in integrated browser and open in system browser; failures keep the existing markdown action reporting with per-action operation names (including copy-link). The custom menu only intercepts context menu for valid web URLs (resolveExternalWebLinkHost); fragment and non-HTTP links fall through to the default browser menu again.

Adds unit tests for menu items, each action, cancellation, host resolution, and error paths.

^{Reviewed by Cursor Bugbot for commit 6f56bf5. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Restore Copy Link option in chat external link context menu

• Extracts context menu logic into a new externalLinkContextMenu.ts module exporting showExternalLinkContextMenu and resolveExternalWebLinkHost.
• The context menu now includes three items: open in preview, open externally, and copy link, with the copy action writing to clipboard via writeTextToClipboard.
• Failures for each action are reported with specific operation identifiers (show-link-context-menu, open-link-in-preview, etc.).
• The menu is only shown for valid http/https links; non-web and same-document links no longer trigger it.

^{Macroscope summarized 6f56bf5.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a "Copy Link" option to the external link context menu by extracting the menu logic into a new testable module. The change is self-contained, includes comprehensive unit tests, and the author has recent commits to this code area.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 1f0312f. Configure here.}

Dismissing prior approval to re-evaluate 2cf6538

[juliusmarminge]

please enable maintainer edits or cherry pick 8f19cb6a onto this branch

[caezium]

@juliusmarminge enabled