Add Explorer Workbench with hierarchical, off-UI Storage analysis.

Storage queries run in the background with cancellation and covering indexes so switching views no longer freezes the UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

Explorer.slnx

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+<Solution>
+  <Folder Name="/src/">
+    <Project Path="src/Explorer.Analysis/Explorer.Analysis.csproj" />
+    <Project Path="src/Explorer.App/Explorer.App.csproj" />
+    <Project Path="src/Explorer.Application/Explorer.Application.csproj" />
+    <Project Path="src/Explorer.Contracts/Explorer.Contracts.csproj" />
+    <Project Path="src/Explorer.Domain/Explorer.Domain.csproj" />
+    <Project Path="src/Explorer.FileOperations/Explorer.FileOperations.csproj" />
+    <Project Path="src/Explorer.Indexing/Explorer.Indexing.csproj" />
+    <Project Path="src/Explorer.Plugin.Abstractions/Explorer.Plugin.Abstractions.csproj" />
+    <Project Path="src/Explorer.Plugin.OneDrive/Explorer.Plugin.OneDrive.csproj" />
+    <Project Path="src/Explorer.Presentation/Explorer.Presentation.csproj" />
+    <Project Path="src/Explorer.Search/Explorer.Search.csproj" />
+    <Project Path="src/Explorer.Storage.Sqlite/Explorer.Storage.Sqlite.csproj" />
+    <Project Path="src/Explorer.Windows/Explorer.Windows.csproj" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests/Explorer.Analysis.Tests/Explorer.Analysis.Tests.csproj" />
+    <Project Path="tests/Explorer.Application.Tests/Explorer.Application.Tests.csproj" />
+    <Project Path="tests/Explorer.Domain.Tests/Explorer.Domain.Tests.csproj" />
+    <Project Path="tests/Explorer.FileOperations.Tests/Explorer.FileOperations.Tests.csproj" />
+    <Project Path="tests/Explorer.Indexing.Tests/Explorer.Indexing.Tests.csproj" />
+    <Project Path="tests/Explorer.Search.Tests/Explorer.Search.Tests.csproj" />
+    <Project Path="tests/Explorer.Storage.Tests/Explorer.Storage.Tests.csproj" />
+  </Folder>
+</Solution>