Both notes-store uploads (uploadAttachment, importNotes) hand-rolled the same fetch + resp.json() + !ok error parsing that api.client already does. Add `api.postForm<T>(path, form)`: request() now detects a FormData body and lets the browser set the multipart Content-Type (skipping the JSON header + stringify), reusing the shared error handling — so the two uploads gain network-error handling and the 5xx infra toast they lacked. A too-large import returns 413 (< 500), so it still throws for inline display rather than toasting. DRY: net -13 lines; no raw fetch() remains in the stores. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm