Fix drawer action menu placement

[hamzamerzic]

Summary

• place app and chat action menus beside the invoking pointer or keyboard-focused item
• use one shared drawer-item action surface across app cards, pinned apps, and chats
• present the same named, touch-friendly action sheet on compact screens
• keep dismissal, focus restoration, edge clamping, and destructive-action behavior consistent

This builds on the drawer interaction model introduced in #281 by replacing the remaining hidden-anchor placement path with one item-owned menu contract.

Validation

• npm run build
• npm test
• focused drawer/menu contract and geometry tests
• git diff --check
• desktop pointer, keyboard, and compact-screen interaction review