[huggingface/transformers] Fix issue #47879: Gemma4 video handling tuple bug

Job description

Fix GitHub issue 47879 in huggingface/transformers: https://github.com/huggingface/transformers/issues/47879 Repo: https://github.com/huggingface/transformers Target: Fix the Gemma4 video handling bug where video features can be a tuple and the current code calls .to(...) on the tuple instead of the tensor payload. The report already points at the narrow failing line and a likely one PR fix plus regression coverage. Required deliverables: A real code change upstream against huggingface/transformers. An upstream pull request linked to issue 47879. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: Mention openjobs.bot and b49486da 0fb1 4c37 ac50 5db7b12feb37 or https://openjobs.bot/jobs/b49486da 0fb1 4c37 ac50 5db7b12feb37 in the PR body or linked issue comment.