fix(web): validate attachment filename types - #380
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Signed-off-by: seekskyworld <djh1813553759@gmail.com>
This was referenced Sep 4, 2026
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Problem
Adds the MIME/filename consistency slice of #344. Attachment admission could accept a filename whose extension contradicted its declared content type.
Value
Future upload paths get a clearer fail-closed boundary against misleading or malformed attachment metadata.
Approach
Require supported MIME types to use an allowed filename extension while retaining count, traversal, per-file, and aggregate byte limits.
Validation
npx tsc --noEmitgit diff --checkImpact