feat(search): build global search across keys, creators, and transact…

[funds0033-cmyk]

Summary

Implemented a global search input in the navigation bar supporting keyboard shortcuts (Cmd/Ctrl+K), debounced queries, and grouped results (keys, creators, transactions) rendered in a dropdown overlay with links to detailed results pages[cite: 17].

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What Was Implemented

1. Navigation Search Bar & Keyboard Shortcut:

   • Added global search input in the navigation bar triggered via Cmd+K (macOS) and Ctrl+K (Windows/Linux)[cite: 17].
   • Applied a 300ms debounce buffer to query executions to prevent excessive API calls[cite: 17].

2. Grouped Dropdown Results:

   • Categorized search responses into three distinct groups: keys, creators, and transactions[cite: 17].
   • Limited dropdown visibility to the top 3 results per group and provided a "View all" navigation link for each category to direct users to the full filtered results page[cite: 17].
   • Added an explicit empty state UI when no matching results are found[cite: 17].

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Acceptance Criteria Verification

• Keyboard shortcut opens search correctly on Mac and Windows[cite: 17]
• Results grouped correctly into three categories[cite: 17]
• Debounce fires at 300ms after last keystroke[cite: 17]
• View all link navigates to correct filtered search results page[cite: 17]
• Empty state shown when no results match query[cite: 17]

Closes #1053

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