Release v0.6.11: show branded update progress and completion

README.md

@@ -184,7 +184,15 @@ Click the notification or **Review update** to check the latest release and conf
 Failed notification submissions are logged and retried after five minutes instead of being marked
 as delivered. Check results and successful submissions are recorded in the log when logging is enabled.
 Network failures stay in diagnostics; the next scheduled check retries. You can also check manually at any time.
-Confirm the offered version to download and install it. The updater uses the existing
+Confirm the offered version to download and install it. A progress window shows
+download percentage and received/total size, package verification,
+installation and restart. After the new process confirms startup, that window shows the installed
+version and a Done button; it does not send a separate completion notification. If installation
+fails after KSwitcher closes, the same window shows recovery and the error. Background checks
+remain silent unless a new version is available. This progress UI is supplied by the updater in
+the currently installed build, so it becomes available for subsequent updates after installing it.
+
+The updater uses the existing
 `KSwitcher-win-x64.zip` and `SHA256SUMS.txt` assets, checks the checksum, package contents, x64
 executable identity and version, then closes and restarts KSwitcher. Downloads and staging happen
 before the application exits. If replacement or startup fails, it restores the previous files;