* fix(desktop): report found app updates during manual checks
Manual checks could reuse cached update state while the renderer discarded pending update details. Keep found update versions visible while downloads prepare, and reserve install affordances for ready updates.
* test(desktop): cover manual update retry after errors
* fix(desktop): keep ready updates ready on recheck
* fix(desktop): show app update check feedback
Manual desktop app update checks now leave visible status feedback even when the shared update state is pending or available. Updater check and preparation errors are carried through the existing result path so the settings row and callout can show the failure instead of only logging it.
* fix(desktop): make update retries perform fresh checks
Manual retries now clear runtime errors emitted by a failed check so the next click calls the updater again. Background checks also skip while a visible manual check is active, and last-checked update copy uses complete localized strings.
* fix(desktop): punctuate update check timestamp copy
* fix(desktop): share runtime update errors
* fix(desktop): preserve update preparation errors
* fix(desktop): settle update check review races
* fix(desktop): settle quiet update check errors
* fix(desktop): handle overlapping update checks
* fix(desktop): preserve preparation errors during checks
Automatic desktop update checks still respect rollout admission. Manual checks carry an explicit intent through the app and desktop updater service, and the up-to-date state now shows when the last check completed.
