v1.07 — Pre-install Office check before installation

- New PreInstallCheckPage between Summary and Progress
- Detects existing Office installs, offers removal before new install
- License cleanup option included
- Skip button to proceed without removal
- Auto-proceeds to install after removal completes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

InstaSoftOfficeTool.csproj

@@ -9,9 +9,9 @@
     <Company>InstaSoft Zrt.</Company>
     <Product>InstaSoft Office Tool</Product>
     <Copyright>Copyright (c) InstaSoft Zrt. 2026</Copyright>
-    <Version>1.0.6</Version>
-    <AssemblyVersion>1.0.6.0</AssemblyVersion>
-    <FileVersion>1.0.6.0</FileVersion>
+    <Version>1.0.7</Version>
+    <AssemblyVersion>1.0.7.0</AssemblyVersion>
+    <FileVersion>1.0.7.0</FileVersion>
     <ApplicationManifest>app.manifest</ApplicationManifest>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>