feat: Add layout debugging/inspecting tool (#14919)

* Add wxInspector dep

* Initial intergration of wxInspector

* docs: add wxInspector plugins design spec

Design spec for two wxInspector plugins (DPIAware + CustomWidgets) that expose
OrcaSlicer's custom control properties in the inspector property grid.

Covers: DPIAware scale-factor properties, Button, CheckBox, TextInput,
SwitchButton, ProgressBar, Label, and LabeledStaticBox.

* docs: add wxInspector plugins implementation plan

6-task plan covering: source changes to existing widget headers,
DPIAwarePlugin, CustomWidgetsPlugin, registration helper,
MainFrame/CMake wiring, and build verification.

* feat: add getters/setters for wxInspector plugin access

Add minimal public accessors to DPIAware (set_scale_factor,
set_prev_scale_factor, set_em_unit, force_rescale), Button
(GetStyle, GetType, IsSelected), CheckBox (IsHalfChecked),
TextInput (GetCornerRadius), and LabeledStaticBox
(GetCornerRadius, GetBorderWidth, GetBorderColor, GetScale).

* feat: add wxInspector plugin registration helper

Add RegisterOrcaInspectorPlugins() inline function that creates
and registers the DPIAwarePlugin and CustomWidgetsPlugin as
static instances (matching wxInspector's built-in pattern).

* feat: add DPIAware wxInspector plugin

Exposes DPI scaling properties (scale_factor, prev_scale_factor,
em_unit, normal_font, force_rescale) on DPIFrame and DPIDialog
widgets. Uses dynamic_cast for detection and a template helper
to capture the correct static type for lambda accessors.

* feat: add OrcaCustomWidgets wxInspector plugin

Exposes Orca-specific properties on 7 widget types:
- Button: Style, Type, Selected
- CheckBox: Half Checked
- TextInput: Label, Text Value, Corner Radius
- SwitchButton: Value
- ProgressBar: Proportion, Show Number
- Label: Is Hyperlink, Font Point Size
- LabeledStaticBox: Corner Radius, Border Width, Border Color, Scale

Each widget type uses dynamic_cast for safe detection.

* feat: wire wxInspector plugins into MainFrame and build

Call RegisterOrcaInspectorPlugins() in MainFrame constructor after
SetupInspectorAccelerator(). Add all 5 plugin source files to
SLIC3R_GUI_SOURCES in CMakeLists.txt.

* fix: move plugin registration to GUI_App::on_init_inner

Register plugins once in app init rather than in MainFrame
constructor, which may be recreated during the application
lifetime.

* fix: include plugin headers in Registration.hpp for complete types

Static locals require complete type. Include DPIAwarePlugin.hpp and
CustomWidgetsPlugin.hpp instead of forward-declaring. Also remove
unused include from MainFrame.cpp (registration moved to GUI_App).

* fix: qualify DPIFrame/DPIDialog with Slic3r::GUI namespace

* Make DPIDialog inspectable. For other dialogs, we will add them if necessary later.

* docs: add spec for moving wxInspectable into DPIAware template

Move wxInspector::wxInspectable base class from DPIDialog and MainFrame
into the common DPIAware<P> template, making all DPIAware widgets
automatically visible in the inspector tree.

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: add implementation plan for moving wxInspectable into DPIAware

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: update spec/plan — move SetupInspectorAccelerator into DPIAware too

Co-Authored-By: Claude <noreply@anthropic.com>

* refactor: move wxInspectable and SetupInspectorAccelerator into DPIAware

DPIAware<P> now inherits wxInspector::wxInspectable and calls
SetupInspectorAccelerator in its constructor, making all DPIAware
widgets automatically appear in the inspector tree with the
Ctrl+Shift+I shortcut. DPIDialog now uses 'using' to inherit the
constructor. Remove redundant wxInspectable inheritance and
SetupInspectorAccelerator calls from DPIDialog and MainFrame.

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: use LB_HYPERLINK constant instead of magic number 0x0020

Co-Authored-By: Claude <noreply@anthropic.com>

* Clean up

* Fix Linux build

* Don't build wxInspector sample

* Use shallow clone

* Try fix flatpak build

* Attempt to fix build again

* Fix build failure caused by https://github.com/wxWidgets/wxWidgets/commit/436c16135ec7ddf580f44624bf74c592aae43b66

* wxWidgets build only download required submodules

* This should fix build on Windows on ARM

* Enable PIC

* Disable layout inspector by default for public release

* Use wxInspector 1.0.0 release

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/slic3r/GUI/GUI_Utils.hpp

@@ -20,6 +20,7 @@
 #include <wx/settings.h>
 #include <wx/dataview.h>
 #include <wx/statbox.h>
+#include <wx/inspector/inspector.h>
 
 #include <chrono>
 #include "Event.hpp"
@@ -88,7 +89,7 @@ void update_dark_ui(wxWindow* window);
 
 extern std::deque<wxDialog*> dialogStack;
 
-template<class P> class DPIAware : public P
+template<class P> class DPIAware : public P, public wxInspector::wxInspectable
 {
 public:
     DPIAware(wxWindow *parent, wxWindowID id, const wxString &title, const wxPoint &pos=wxDefaultPosition,
@@ -107,6 +108,7 @@ public:
         this->SetFont(m_normal_font);
 #endif
         this->CenterOnParent();
+        SetupInspectorAccelerator(this);
 #ifdef _WIN32
         update_dark_ui(this);
 #endif
@@ -182,6 +184,11 @@ public:
 
     float   scale_factor() const        { return m_scale_factor; }
     float   prev_scale_factor() const   { return m_prev_scale_factor; }
+    // Only meant to be used by inspector, not public API
+    void    set_scale_factor(float v)      { m_scale_factor = v; }
+    void    set_prev_scale_factor(float v) { m_prev_scale_factor = v; }
+    void    set_em_unit(int v)             { m_em_unit = v; }
+    bool    force_rescale() const          { return m_force_rescale; }
 
     int     em_unit() const             { return m_em_unit; }
 //    int     font_size() const           { return m_font_size; }