**Description:** - Implement search bar component visible in header on desktop, in overlay on mobile - Use a mock search index to return results for pages, actions, and records - Provide result groups (Pages, Actions, Records) with keyboard navigation - Design spec (must use; measurable): - Tokens per Issue 3 - Input height 44px; clear icon; debounce 250–400ms - Result rows min-height 44px; active row visually distinct and announced - Empty state with guidance copy **Acceptance Criteria:** - [ ] Search opens, filters, and navigates via keyboard - [ ] Grouped results from mock index - [ ] Empty and error states implemented - [ ] PR includes screenshots and short demo GIF
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