fix(updater): check for updates on every Outlook startup, not every 7 days

Why v1.2.7→v1.2.8 didn't auto-install on Outlook restart: the manifest
was published with <UpdateInterval>7</UpdateInterval> + units=days, which
tells the VSTO runtime "don't even check the manifest URL more often
than once a week." MinimumRequiredVersion (set by CI to the same tag
version) would have forced the install — but only AFTER the check runs,
and the check was throttled to weekly.

Replace UpdateInterval/UpdateIntervalUnits with UpdatePeriodically=false.
This omits the <expiration> element from the deployment manifest, which
ClickOnce/VSTO interprets as "check before every host start." The extra
HTTP GET on the .vsto manifest at Outlook launch is ~6KB, ~100ms — a
non-issue for startup time, vs. the previous behavior where new
releases sat unused on platform.dev for up to a week per user.

From v1.2.9 onward, tag → CI publishes → next Outlook launch on each
lawyer's PC installs it. This is what we wanted the auto-update chain
to look like all along.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/OutlookAddin/OutlookAddin.csproj

@@ -36,11 +36,10 @@
     <PublishUrl>C:\Users\Chaim\source\repos\OutlookAddin\Publish\</PublishUrl>
     <InstallUrl>https://gitea.dev.marcus-law.co.il/espocrm-extensions/OutlookAddin/raw/branch/main/Publish/</InstallUrl>
     <TargetCulture>en</TargetCulture>
-    <ApplicationVersion>1.2.7.0</ApplicationVersion>
+    <ApplicationVersion>1.2.9.0</ApplicationVersion>
     <AutoIncrementApplicationRevision>false</AutoIncrementApplicationRevision>
     <UpdateEnabled>true</UpdateEnabled>
-    <UpdateInterval>7</UpdateInterval>
+    <UpdatePeriodically>false</UpdatePeriodically>
-    <UpdateIntervalUnits>days</UpdateIntervalUnits>
     <ProductName>MarcusLaw.OutlookAddin</ProductName>
     <PublisherName />
     <SupportUrl />

src/OutlookAddin/Properties/AssemblyInfo.cs

@@ -33,6 +33,6 @@ using System.Security;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.2.7.0")]
+[assembly: AssemblyVersion("1.2.9.0")]
-[assembly: AssemblyFileVersion("1.2.7.0")]
+[assembly: AssemblyFileVersion("1.2.9.0")]