[MeshCentral - 1]. Remote desktop: manageable shortcuts with settings modal

[romanivan-flamingo]

Summary

Part of the Remote Access Approval Flow epic (ClickUp 86agfp8w9), subtask [Admin FE] Shortcuts manager (86ajx048c). Figma: Shortcuts Settings modal (1-70785), actions menu (1-70731).

• New Shortcuts Settings modal: reorder via drag (dnd-kit, same pattern as scripts v2 schedule), delete, add new shortcut (Shift/Alt/Ctrl/Win checkboxes + key input). Edits live in a draft and apply on Save Shortcuts only.
• Shortcuts are stored in localStorage as comboToSequence-compatible combo strings ('shift+win+m') - the exact format MeshDesktop.sendKeyCombo consumes. Defaults = the previous hardcoded 8.
• Apply Shortcut submenu is generated from the stored list, with a leading Manage Shortcuts item per design.
• Sending unified into one sendShortcut(combo) path (drops the VK-array remapping table and the separate Ctrl+Alt+Del handler; 'alt+ctrl+del' keeps its secure-attention special case inside MeshDesktop), now guarded on an active connection.

Test plan

• Apply Shortcut submenu shows Manage Shortcuts + the 8 defaults
• Modal: drag-reorder (pointer + keyboard), delete, add (valid key, invalid key -> toast, duplicate -> toast)
• Close without Save discards edits; Save persists across reload (remote-desktop:shortcuts)
• On a live Windows device: Win+M / Win+L / Alt+Ctrl+Del and a newly added custom combo reach the agent; toasts show combo label + description
• Regression: power actions, Enable Input, Clipboard Sharing still work from the same menu

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