Fix Android project: add OutputType Exe for APK generation

Without OutputType=Exe, .NET treats the Android project as a library
and produces an .aar instead of an .apk. Also improved APK search
in the CI workflow with better diagnostics.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: sharpninja

.github/workflows/build-android.yml

@@ -93,9 +93,16 @@ jobs:
       - name: Find and rename APK
         id: find-apk
         run: |
-          APK=$(find src/RequestTracker.Android/bin/Release -name "*.apk" | head -1)
+          echo "=== All output files ==="
+          find src/RequestTracker.Android/bin/Release -type f -name "*.apk" -o -name "*.aab" | sort
+          echo "=== Searching for APK ==="
+          # Search for signed APK first, then any APK
+          APK=$(find src/RequestTracker.Android/bin/Release -name "*-Signed.apk" | head -1)
           if [ -z "$APK" ]; then
-            echo "ERROR: No APK found!"
+            APK=$(find src/RequestTracker.Android/bin/Release -name "*.apk" | head -1)
+          fi
+          if [ -z "$APK" ]; then
+            echo "ERROR: No APK found! Full file listing:"
             find src/RequestTracker.Android/bin/Release -type f
             exit 1
           fi

src/RequestTracker.Android/RequestTracker.Android.csproj

@@ -1,5 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
+    <OutputType>Exe</OutputType>
     <TargetFramework>net9.0-android</TargetFramework>
     <Nullable>enable</Nullable>
     <ApplicationId>com.requesttracker.android</ApplicationId>