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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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 79a883a4-bbe1-4bac-8a3b-443f07a6cff7

📥 Commits

Reviewing files that changed from the base of the PR and between ecb35f7 and 67a8426.

📒 Files selected for processing (5)

• apps/desktop/src/electron/ElectronMenu.ts
• apps/web/src/components/ComposerPromptEditor.tsx
• apps/web/src/components/files/FileBrowserPanel.tsx
• docs/fork/0001-file-explorer-mention-actions.md
• docs/fork/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/feat-file-explorer-mentions

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