Self-review: fix stale comment quoting renamed empty-state string

Review of this session's audit batch (L106/L107/L122, L119/L151/L153, M3, M17,
M18, M23/M27, R8, L62). One issue found and fixed:

- SettingsView copyErrorReport comment quoted the old "No errors logged."
  empty-state string, which L119 renamed to "No errors yet." Reworded the
  comment to not quote a specific string.

Everything else verified sound: M3 recordCompletion is a faithful extraction
(+ a correct canceled-item bugfix); M17 status precedence; M18 migration; M23
per-source budget cap; M27 enqueueKind state is safe (only the expanded source
renders its detail); R8 pretty flag; L62 drop of the synthetic ext has no
consumers. No BOM churn. The incidental em-dash->-- conversions in
jsonStore/sources comments leave each file internally consistent and aligned
with the project's ASCII convention, so they stand.

typecheck + 242 tests + eslint green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/renderer/src/components/SettingsView.tsx

@@ -378,7 +378,7 @@ export function SettingsView(): React.JSX.Element {
 
   function copyErrorReport(): void {
     // The button is disabled when there are no entries, so `report` is always
-    // non-empty here -- no need for an unreachable "No errors logged." fallback (L159).
+    // non-empty here -- no need for an unreachable empty-report fallback (L159).
     const report = errorEntries
       .map((e) =>
         [new Date(e.occurredAt).toLocaleString(), e.title ?? e.url, e.url, e.error].join('\n')