feat: 32-bit process support, scanner rescan filtering, suppress flash on navigate

- Add pointerSize() to Provider base; WoW64/ELF detection in ProcessMemory,
  WinDbg, and RemoteProcessMemory plugins
- Wire pointer size through NodeTree, source/XML imports, C++ generator,
  controller, compose, address parser, and RPC protocol header
- Add is32Bit to PluginProcessInfo and ProcessInfo; show (32-bit) in picker
- Scanner rescan now filters results against the current input value
- Go-to-address from scanner resets change tracking to prevent false flashing

src/providers/provider.h

@@ -43,6 +43,10 @@ public:
     // Examples: "File", "Process", "Socket"
     virtual QString kind() const { return QStringLiteral("File"); }
 
+    // Native pointer size of the target (4 for 32-bit, 8 for 64-bit).
+    // Providers should override this to report the target's architecture.
+    virtual int pointerSize() const { return 8; }
+
     // Initial base address discovered by the provider (e.g. main module base).
     // Used by the controller to set tree.baseAddress on first attach.
     // For file/buffer providers this is always 0.