feat: scanner panel with signature/value search, rescan, address delegate

- Signature mode (IDA-style patterns with wildcards) and value mode (typed exact match)
- Async scan engine with progress, cancel support
- Re-scan updates all results with unified progress (single-pass read + table build)
- Previous value column appears after first re-scan
- WinDbg backtick address format with dimmed leading zeros (AddressDelegate)
- Inline editing: address expressions navigate, value edits write to provider
- Right-click context menu: Copy Address, Copy Value, Go to Address
- Auto-sized columns, themed buttons with icons, dynamic combo width
- 49 UI tests covering scan, rescan, editing, theming, progress completion

CMakeLists.txt

@@ -79,6 +79,10 @@ add_executable(Reclass
     src/imports/import_pdb.cpp
     src/imports/import_pdb_dialog.h
     src/imports/import_pdb_dialog.cpp
+    src/scanner.h
+    src/scanner.cpp
+    src/scannerpanel.h
+    src/scannerpanel.cpp
     src/mainwindow.h
     src/optionsdialog.h
     src/optionsdialog.cpp
@@ -235,6 +239,11 @@ if(BUILD_TESTING)
     target_link_libraries(test_static_fields PRIVATE ${QT}::Core ${QT}::Test)
     add_test(NAME test_static_fields COMMAND test_static_fields)
 
+    add_executable(test_scanner tests/test_scanner.cpp src/scanner.cpp)
+    target_include_directories(test_scanner PRIVATE src)
+    target_link_libraries(test_scanner PRIVATE ${QT}::Core ${QT}::Concurrent ${QT}::Test)
+    add_test(NAME test_scanner COMMAND test_scanner)
+
     if(WIN32)
         add_executable(test_import_pdb tests/test_import_pdb.cpp
             src/imports/import_pdb.cpp src/format.cpp src/compose.cpp src/addressparser.cpp)
@@ -392,6 +401,14 @@ if(BUILD_TESTING)
     endif()
     add_test(NAME test_source_provider COMMAND test_source_provider)
 
+    add_executable(test_scanner_ui tests/test_scanner_ui.cpp
+        src/scanner.cpp src/scannerpanel.cpp src/addressparser.cpp
+        src/themes/theme.cpp src/themes/thememanager.cpp)
+    target_include_directories(test_scanner_ui PRIVATE src)
+    target_link_libraries(test_scanner_ui PRIVATE
+        ${QT}::Widgets ${QT}::Concurrent ${QT}::Test)
+    add_test(NAME test_scanner_ui COMMAND test_scanner_ui)
+
     # Disabled: WinDbg provider test has build errors (lastError API changed)
     #if(WIN32)
     #    add_executable(test_windbg_provider tests/test_windbg_provider.cpp