feat: implement global command menu with Cmd/Ctrl+K keyboard shortcuts #35

[Ghadaffijr]

Description

This PR introduces a new global Command Menu to improve dashboard navigation and power-user accessibility. Users can now easily open a universal search/command modal from anywhere in the app using standard keyboard shortcuts.

Closes #35 ## Key Changes

• New Component: Built an isolated CommandMenu.tsx component with a polished UI and responsive search overlay.
• Keyboard Listeners: Added global event hooks for Cmd/Ctrl + K to toggle the menu, and Escape to close it safely.
• Header Integration: Injected the visual search trigger button into the main Header.tsx layout alongside the recent Wagmi network updates.
• Maintained Sync: Successfully resolved merge conflicts and synced with upstream main to ensure a clean, fast-forward merge.

How to Test

1. Checkout this branch locally: git checkout feat/keyboard-shortcuts
2. Run npm install to ensure all packages match the updated lockfile.
3. Start the server: npm run dev
4. Press Cmd + K (Mac) or Ctrl + K (Windows) anywhere in the app to verify the modal opens.
5. Press Escape to verify the modal closes.

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[Ghadaffijr]

Heads up for the reviewers: I successfully resolved the merge conflicts for the Command Menu. While pushing, I noticed the backend CI was failing at the linting step, so I removed a couple of unused variables in routes/stellar.ts to unblock it.

However, it looks like the backend test suite is currently failing on main (validateStellarAddress is not a function in stellar.validation.test.ts). Since this is related to upstream backend changes, I'll leave that for the maintainers to patch. The frontend Command Menu feature is completely green and ready for review!

[Smartdevs17]

headers is having issue please resolve.