Google closed Tenor v2 to new API clients in Jan 2026, so the only
people who could use the picker were those with a pre-existing Google
Cloud Console key. Swapped to GIPHY's Developer API (still open, free
keys at https://developers.giphy.com/dashboard/).
- Env var renamed VITE_TENOR_API_KEY → VITE_GIPHY_API_KEY
- Endpoint, response mapping, error sentinel updated
- File still named tenor.ts for import-path stability — renaming
later if it bothers anyone
- Public GifResult interface unchanged so the picker UI didn't need
edits beyond the error-message switch
byGalax