fix: add null guard in getYahooIndiaSuggestions to prevent TypeError

[Cocoon-Break (kuishou68)]

Closes #722

Problem

In getSearchSuggestions.ts, the getYahooIndiaSuggestions function accesses data.gossip.results without any null/undefined guard:

return data.gossip.results.map((item: YahooSuggestionItem) => item.key) || []

If the Yahoo API returns an unexpected response shape (e.g. data.gossip is null or undefined), this throws an uncaught TypeError that can break the search suggestions UI entirely. Every other provider safely uses data[1] || [], but Yahoo lacks this protection.

Fix

Use optional chaining and nullish coalescing, consistent with how other providers handle missing data:

return data?.gossip?.results?.map((item: YahooSuggestionItem) => item.key) ?? []

This ensures an empty array is safely returned when the API response is missing or malformed.

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[Cocoon-Break (kuishou68)]

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