fix: [BOUNTY] [level:intermediate] Add Interactive Keyboard Shortcuts for Rapid Admin Dashboard Navigation

[saij3b]

Closes #640.

Frontend deps not installed. Pre-existing env state; my changes are syntactically clean React code following the file's existing conventions.

Summary

Added Frontend/src/hooks/useKeyboardShortcuts.js — a custom hook that registers a global keydown listener, recognizes two-key sequences (G+D, G+T, G+U, G+A, G+P, G+S) within a 1.2s window and navigates via React Router, plus Ctrl/Cmd+F to focus the first search input; it ignores keys while typing in inputs/textareas. Wired the hook into AdminLayout.jsx so it activates across the admin dashboard, and added a Keyboard Shortcuts button in Help.jsx that opens a small legend overlay listing every active shortcut (driven by the exported SHORTCUTS_LEGEND).

Tests: no test suite detected

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📥 Commits

Reviewing files that changed from the base of the PR and between da8faf2 and 7d6277f.

📒 Files selected for processing (3)

• Frontend/src/admin/layout/AdminLayout.jsx
• Frontend/src/hooks/useKeyboardShortcuts.js
• Frontend/src/user/pages/Help.jsx

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[espcris05-commits]

👋 Bounty PR ready for review. CodeRabbit and Vercel CI passed. This PR addresses the bounty requirements. Please let me know if any changes are needed.

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