Search: persistent recent searches + clear input on pop

Created by: jedmund

Summary

• Adds a UserDefaults-backed RecentSearchesStore that keeps the user's last 10 tag submissions, LRU-promoted on repeat, JSON-encoded under recentSearches.v1.
• SearchView surfaces the list below the input whenever the field is empty; suggestions take over the moment any text is typed. No dividers between rows per design.
• Tapping a recent row performs the search instantly (no intermediate field-fill).
• performSearch records every submission (including keyboard-submitted raw text) and clears searchText post-push, so popping back from a feed lands on a clean Search screen showing recents.

Test plan

• Type a query, pick a suggestion → feed pushes; pop back → field is empty, recent appears at the top of the list
• Type raw text, hit return → same behavior; recent with no translation
• Submit the same query twice → one entry, most recent on top
• Submit 11 distinct queries → only the 10 most recent are kept
• Kill the app and relaunch → recents persist
• Start typing → recents hide, suggestions take over
• Clear the field via the X → recents return

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