feat: workspace panel visual overhaul, perf optimizations, remove kernel base addresses

Workspace panel:
- Custom WorkspaceDelegate: struct names bright, metadata dimmed, child types in teal
- Search box: monospace font, search icon, bordered with focus highlight
- Selection: accent bar, all fonts synced to 10pt monospace
- Remove rebuildWorkspaceModel from visibilityChanged (fixes double-click refresh)
- Incremental sync (syncProjectExplorer) preserves tree expansion state

Performance:
- childrenOf() O(1) via cached parent→children hash map
- Debounced workspace rebuilds (50ms coalesce)
- Pre-reserve node vector in NodeTree::fromJson
- Benchmark suite (bench_project)

Data:
- Remove kernel baseAddress from Vergilius/WinSDK examples (default to 0x400000)

CMakeLists.txt

@@ -500,6 +500,14 @@ if(BUILD_TESTING)
         endif()
         add_test(NAME bench_large_class COMMAND bench_large_class)
 
+        add_executable(bench_project tests/bench_project.cpp)
+        target_include_directories(bench_project PRIVATE src)
+        target_link_libraries(bench_project PRIVATE ${QT}::Widgets ${QT}::Test)
+        if(WIN32)
+            target_link_libraries(bench_project PRIVATE dbghelp psapi ${_QT_WINEXTRAS})
+        endif()
+        add_test(NAME bench_project COMMAND bench_project)
+
         # Deploy Qt runtime DLLs for tests (run windeployqt on a representative test exe
         # that links the broadest set of Qt modules; all test exes share the same output dir)
         if(TARGET ${QT}::windeployqt)