Add a themed WebView color picker with persistent favorites (#16197)

* Define validated color picker selection contract

* Integrate web color picker with gradient and alpha controls

Co-authored-by: yw4z <ywsyildiz@gmail.com>

* Apply shared Orca theme to web color picker

* Host color picker in a validated WebView dialog

* Persist color picker favorites in user preferences

* Integrate localized web color picker with filament actions

* Add color picker browser regressions and verify direct includes

* Fit color picker content in a borderless floating panel

* Anchor color picker panels to their triggering controls

* Use accent foreground for selected color picker switches

* Integrate web color picker into generic color fields

* Use web color picker for AMS custom colors

* Use shared web color picker from Linux sidebar menu

* Use web color picker when adding texture import material

* Preserve alpha in filament color picker actions

* Clean up color picker asset whitespace

* Use application translations for color picker validation

* Preserve existing formatting in color picker integration

* Match SpeedDial rounded window handling on macOS

* Align color picker host behavior with SpeedDial

* Consolidate color picker implementation into its dialog

* Remove native color picker fallback

* Limit color picker interfaces to production consumers

* Use shared WebView translation field name

* Reapply anchored color picker placement after GTK show

* update

* fix increment buttons not working on spin inputs

* Use thumb color from its own channel

* init gradients with shifted color for second color

* fix hsl sliders cannot move freely and lock downs other one

* unify save button and color preview & increase stored color count to 32

* switch to hsl based calculation and fix plot and slider drag events

* update

* add support for multi colored gradients

* Update test_filament_color_picker.cpp

* add filtering color palette and store sidebar and combo state

* open dialog with calculated size

* apply shadow to dialog on windows

* add tooltip for gradient add color button

* Restore draggable fixed-size color picker frame

* Fix color picker sidebar sizing in WebKit

* Fix invisible default filament color button on macOS

* Remove duplicated color defs for color picker

* Remove duplicate HTML color picker frame

* Match color picker tests to current theme roles

* update icons

* use focus color on background of filter box

* align gradient switch with hex input

* fix initial window sizing

* Preserve caller color order when drawing filament icons

---------

Co-authored-by: yw4z <ywsyildiz@gmail.com>

src/slic3r/GUI/wxExtensions.cpp

@@ -19,7 +19,7 @@
 #include <wx/dcclient.h>
 #include <wx/dcmemory.h>
 #include <wx/colour.h>
-#include <wx/colourdata.h>
+#include <wx/dialog.h>
 #include <wx/anybutton.h>
 #include <wx/object.h>
 #include <wx/popupwin.h>
@@ -630,43 +630,6 @@ std::vector<std::vector<std::string>> read_color_pack(std::vector<std::string> c
     return color_info;
 }
 
-wxColourData show_sys_picker_dialog(wxWindow *parent, const wxColourData &clr_data)
-{
-    wxColourData data = clr_data;
-    data.SetChooseFull(true);
-
-    // Load custom colors from config (support both "r,g,b,a" and "#RRGGBB" formats)
-    std::vector<std::string> colors = Slic3r::GUI::wxGetApp().app_config->get_custom_color_from_config();
-    for (int i = 0; i < (int)colors.size(); i++) {
-        wxColour c;
-        if (colors[i].find(',') != std::string::npos)
-            c = string_to_wxColor(colors[i]);
-        else
-            c = wxColour(colors[i]);
-        if (c.IsOk())
-            data.SetCustomColour(i, c);
-    }
-
-    wxColourDialog dialog(parent, &data);
-    dialog.SetTitle(_L("Please choose the filament color"));
-
-    if (dialog.ShowModal() == wxID_OK) {
-        data = dialog.GetColourData();
-
-        // Save custom colors to config (use RGBA string format for consistency)
-        std::vector<std::string> colors;
-        colors.resize(CUSTOM_COLOR_COUNT);
-        for (int i = 0; i < CUSTOM_COLOR_COUNT; i++) {
-            wxColour custom_clr = data.GetCustomColour(i);
-            if (custom_clr.IsOk())
-                colors[i] = color_to_string(custom_clr);
-        }
-        Slic3r::GUI::wxGetApp().app_config->save_custom_color_to_config(colors);
-    }
-
-    return data;
-}
-
 wxBitmap *get_extruder_color_icon(std::vector<std::string> colors, bool is_gradient, std::string label, int icon_width, int icon_height,
                                   const std::vector<wxColour> *ramp){