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feat(upload): ship Uppy lifecycle events to Loki so photo-upload failures are observable

The Uppy handlers in OurUploader.vue were already wired but only console.log'd, so
photo-upload failures were invisible server-side: the only signal reaching Loki/Sentry
was a 30s modal-open timer ("Uppy timed out"), which fires regardless of whether an
upload was even attempted. This meant "opened the picker but never selected a photo"
was indistinguishable from "selected a photo, upload stalled/failed".

Emit structured action() events (event_type=action, already flowing to Loki via
useClientLog): upload_file_selected (file size/type), upload_started, upload_succeeded,
upload_failed{reason}, upload_stalled{reason}, upload_rejected{reason}, and
upload_modal_open_30s (relabelled so it's clearly not a failure). console.log lines kept.

Diagnosed via the logged-out OFFER give-funnel: photos->details is the biggest in-flow
drop, driven mostly by sessions that upload no photo; a small friction tail attempts a
photo but never uploads and is mostly lost, but it can't be root-caused until the upload
path is instrumented. This is that instrumentation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015DQRL5iGD71jNTgyokMpt9

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