Fix #9: improve accessibility labels for image upload previews

[magnet78]

Closes #9

Improved accessibility labels for image upload previews in both AI image detection and content verification flows:

Changes:

• Updated generic alt="Aperçu" to alt="Image upload preview — selected file preview" in both AIImageDetection.js and ImageContentVerification.js
• This provides screen reader users with more descriptive context about what the image preview represents

Files modified:

• client/src/components/AIImageDetection.js
• client/src/components/ImageContentVerification.js

[immerSIR]

Thanks for tackling #9. This still needs a small pass before merge.

CodeRabbit flagged, and I confirmed against the surrounding UI, that the new preview alt text is English and redundant (Image upload preview — selected file preview) while these flows are French. Please switch both preview labels to concise French copy, ideally including the selected file name when available, for example Aperçu de l'image sélectionnée : ${selectedImage.name} with a fallback.

Also, #9 specifically asks that screen readers can distinguish the AI detection upload control from the content-verification upload control. This PR updates only the preview images; please add clear accessible names to the hidden file inputs/buttons in both flows, such as distinct aria-label values that match each page context.

If the existing client test setup can cover it, please add/update a lightweight accessibility-label test; otherwise note why it is not practical in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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