Unify color scheme: orange primary, rose accent, gray neutral

- Primary (orange): search button, active filters, selected cards,
  channel tags, links, input focus ring
- Accent (rose): favorites/heart only
- Neutral (gray): price tags, inactive buttons
- Semantic colors preserved: red for 폐업, yellow for 임시휴업

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/SearchBar.tsx

@@ -25,7 +25,7 @@ export default function SearchBar({ onSearch, isLoading }: SearchBarProps) {
         value={query}
         onChange={(e) => setQuery(e.target.value)}
         placeholder="식당, 지역, 음식..."
-        className="flex-1 min-w-0 px-3 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 text-sm"
+        className="flex-1 min-w-0 px-3 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-orange-400 text-sm"
       />
       <select
         value={mode}
@@ -39,7 +39,7 @@ export default function SearchBar({ onSearch, isLoading }: SearchBarProps) {
       <button
         type="submit"
         disabled={isLoading || !query.trim()}
-        className="shrink-0 px-3 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 text-sm"
+        className="shrink-0 px-3 py-2 bg-orange-500 text-white rounded-lg hover:bg-orange-600 disabled:opacity-50 text-sm"
       >
         {isLoading ? "..." : "검색"}
       </button>