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Head commit for run: 9ccf250d29d1cd85b78dea47c090b65c4cf30dd8 / carloea2 <[email protected]> feat(frontend): preview xlsx dataset files (#8113) ### What changes were proposed in this PR? Map the `.xlsx` extension to the existing Excel preview MIME type. This lets the existing workbook parser render dataset spreadsheets instead of rejecting them as generic binary files. ### Any related issues, documentation, discussions? Closes #8112 ### How was this PR tested? Regression test before the fix: `yarn test --include src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-file-renderer/user-dataset-file-renderer.component.spec.ts` The new assertion failed because `.xlsx` resolved to `application/octet-stream`. The other 54 tests passed. Verification after the fix: `yarn test --include src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-file-renderer/user-dataset-file-renderer.component.spec.ts` All 55 tests passed. `yarn format:ci` Formatting passed. Live verification in Chrome: 1. Started Texera locally from this worktree. 2. Created a dataset and uploaded a valid `.xlsx` workbook. 3. Confirmed current main showed the unsupported preview message. 4. Confirmed this branch rendered the same workbook as a table. ### Was this PR authored or co-authored using generative AI tooling? Generated-by: Codex Report URL: https://github.com/apache/texera/actions/runs/33286230043 With regards, GitHub Actions via GitBox
