feat: file explorer mention actions and zoom-aware context menus

[yordis]

• Attaching files to a prompt required typing @-mentions by hand even though the file explorer already has the file in front of you; right-click now offers Copy mention and Add to chat so browsing and prompting stay in one flow.
• Copied mention text degraded to plain text on paste because the composer only tokenized programmatic inserts, which made sharing mentions between surfaces pointless.
• Native context menus drifted away from the cursor whenever the window was zoomed, proportionally to the distance from the window origin, so the new file-explorer menu (far right edge) was unusable while left-edge menus only looked fine by accident; every coordinate-positioned menu in the desktop app was affected.

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Note

Low Risk
Localized UX in composer, file browser, and Electron menu positioning; no auth or data-model changes.

Overview
Adds file explorer right-click actions so you can Copy mention or Add to chat without typing @ paths manually. The tree uses a capture-phase contextmenu listener for pointer position (shadow DOM anchor rects are unreliable) and calls the desktop contextMenu API; Add to chat goes through insertTextAtEnd with a new ensureLeadingBoundary option that inserts a leading space when the prompt needs it.

The composer now parses pasted plain text for file mention tokens and turns them into mention chips (line breaks preserved, boundary whitespace handled), so copied mentions stay useful after paste.

Desktop context menus scale popup coordinates by webContents.getZoomFactor() so CSS-pixel positions match Electron’s window points; tests cover zoomed popup x/y.

^{Reviewed by Cursor Bugbot for commit a3bd873. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add file explorer right-click context menu with mention actions and zoom-aware positioning

• Right-clicking a file tree entry in FileBrowserPanel.tsx opens a context menu with "Copy mention" and "Add to chat" actions; pointer coordinates are captured via a capture-phase listener to work around shadow DOM anchor rect limitations.
• "Add to chat" calls insertTextAtEnd on the composer handle with a new ensureLeadingBoundary option that prepends a space when the prompt doesn't end in whitespace.
• Pasting text into the composer now detects inline mention tokens and converts them into composer mention nodes, preserving line breaks and adding boundary whitespace as needed.
• Context menu popup coordinates in ElectronMenu.ts are now scaled by the window's zoom factor and floored, so menus appear at the correct position on zoomed windows.

^{Macroscope summarized a3bd873.}

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[yordis]

Screen.Recording.2026-07-16.at.5.12.58.AM.mov

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces new user-facing features including file explorer context menu actions (copy mention, add to chat) and a paste handler that parses and converts mentions in pasted text. New capabilities affecting user interaction patterns warrant human review.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 2 potential issues.

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^{Reviewed by Cursor Bugbot for commit 718e283. Configure here.}