fix: key search results so there are no duplicates (#152)

## Summary
Noticed that the search was behaving weird and there were sometimes
duplicates in the list when typing. This is because the `{#each}` block
was not keyed.

## Checklist
- [ ] Added Unit Tests
- [ ] Covered by existing CI
- [ ] Integration tested
- [ ] Documentation update



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Enhanced rendering performance of search results in the navigation
bar.
- Conditional disabling of command items based on entity names for
improved interactivity.
	- Improved visibility control for the command dialog.

- **Bug Fixes**
- Maintained consistent error handling and event management for keyboard
shortcuts.

- **Documentation**
- Updated type definitions for exported properties in the navigation bar
component.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: ken-zlai

frontend/src/lib/components/NavigationBar/NavigationBar.svelte

@@ -198,7 +198,7 @@
 			{/if}
 		{:else}
 			<CommandGroup heading={`Search for "${input}"`}>
-				{#each searchResults as entity}
+				{#each searchResults as entity (entity.name)}
 					<!-- todo: enable this once we have data for all joins -->
 					<CommandItem
 						disabled={entity.name !== 'risk.user_transactions.txn_join'}