Improve mimetype detection when serving a task output file

[julien-nc]

We now deal with the file download just like when saving and generating a preview.

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• The content of this PR was partly or fully generated using AI (N/A)

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: d042b18e-062b-46ad-acfb-c6ed283fc848

📥 Commits

Reviewing files that changed from the base of the PR and between fe8b945 and 66e2ad4.

📒 Files selected for processing (1)

• lib/Controller/AssistantApiController.php

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📝 Walkthrough

Walkthrough

getOutputFile now detects the output file MIME type from its first 4096 bytes using finfo(FILEINFO_MIME_TYPE)->buffer(). The existing application/octet-stream fallback remains unchanged.

Merge Risk: ⚪ Minimal · up to 66e2a

The MIME detection change does not consume the downloaded content. No concrete merge-blocking risk is established; the PR is ready for normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description states that file download handling now matches the handling used for saving files and generating previews. This is related to the MIME type detection change.
Title check	✅ Passed	The title clearly and concisely identifies the main change: improved MIME type detection when serving task output files.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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