feat: persist favorites in localStorage #62
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Add a localStorage helper wrapper, load saved favorites on startup, and write updates back on change. Corrupted or invalid stored JSON falls back to no favorites instead of crashing; only country codes are stored, never the fetched country data. Closes #33
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Add a localStorage helper wrapper, load saved favorites on startup, and write updates back on change. Corrupted or invalid stored JSON falls back to no favorites instead of crashing; only country codes are stored, never the fetched country data.
Closes #33