A resumable-but-failed download leaves partial component files in update-staging.
has_staged_update() treated ANY staged file as "install-ready", so the state
self-heal kept update_in_progress=true and the UI showed Install instead of
Download (no clean retry).
- update.rs: write a .download-complete marker only after EVERY component
downloads+verifies; has_staged_update() now checks that marker. Partial/failed
downloads (no marker) correctly read as not-staged → self-heal clears
update_in_progress → UI shows Download. Resume still works (partial files kept).
- SystemUpdate.vue: on a genuine download failure, reset downloaded/in_progress
and re-sync, so the user lands back on Download immediately.
cargo check + vue-tsc clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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