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Ethan
353e522614
Closes CODAGT-216 ## Problem `dbpurge` deletes `chat_files` rows after the deployment's configured retention window, but `chat_messages.content` can still contain `file_id` references to those files. On replay, that left the Anthropic provider with an empty file payload and a `400 image cannot be empty` error. In the UI, the same missing file showed up as a broken image. ## Fix - Backend: when replay hits a `file_id` whose bytes are gone, replace it with a short text placeholder instead of emitting an empty file part. We could also drop the missing attachment entirely, but that would silently remove context from the replay and make the conversation harder for the model to interpret. The placeholder keeps the request valid while still telling the model that a file used to be there and is no longer available. - Frontend: classify chat image failures instead of treating every broken image the same. - `404` file fetches render `Image expired`, with a tooltip explaining that chat attachments are deleted after the retention window set for the deployment. - Other remote failures render `Image failed to load`, with a tooltip that surfaces server/network detail when available. - Invalid inline image data still renders `Image failed to load` without a probe.