- New "Served by {mirror}" line on the System Update page so operators can see
which mirror actually served the available manifest (vs. which is configured
primary). Backend threads the served URL through UpdateState.manifest_mirror.
- New update.test-mirror RPC + per-row lightning-bolt button that pings a
mirror and renders reachable/latency or error inline under the URL.
- UI polish on the mirrors section: Set Primary, Remove, and the new Test
action are compact icon buttons; add-mirror form moved into a dialog.
- "What's New" block prepended for v1.7.27-alpha.
21/21 update module tests pass. vue-tsc + vite build clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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