Fix RmlUi compatibility issues

- Add Focus() method to RmlUiField base class for dialog compatibility
- Fix abstract_state.lua to handle editors without window property
- Remove invalid 'decorator: image' CSS rule, use filter instead
- Prevents crashes when using file dialogs and editor states in RmlUi mode

Author: claude

scen_edit/state/abstract_state.lua

@@ -42,8 +42,13 @@ function AbstractState:KeyPress(key, mods, isRepeat, label, unicode)
     end
 
     local editor = self:__GetEditor()
-    if editor and not editor.window.__disabled then
-        if editor:KeyPress(key, mods, isRepeat, label, unicode) then
+    if editor then
+        -- In RmlUi mode, editors don't have a window property
+        local canProcessKey = true
+        if editor.window and editor.window.__disabled then
+            canProcessKey = false
+        end
+        if canProcessKey and editor:KeyPress(key, mods, isRepeat, label, unicode) then
             return true
         end
     end

scen_edit/view/rcss/springboard.rcss

@@ -297,8 +297,8 @@ body#springboard {
 }
 
 .action-button.pressed .action-button-icon {
-    decorator: image;
-    image-color: #00ff00;
+    /* Green tint for pressed state - using filter instead of decorator */
+    filter: brightness(1.2) sepia(0.5) hue-rotate(70deg);
 }
 
 .action-button-label {

scen_edit/view/rmlui_fields.lua

@@ -45,6 +45,16 @@ function RmlUiField:Set(value)
     self:SetValue(value)
 end
 
+function RmlUiField:Focus()
+    -- Focus the input element (for dialogs)
+    if SB.view and SB.view.mainDocument then
+        local input = SB.view.mainDocument:GetElementById("field-" .. self.name)
+        if input and input.Focus then
+            input:Focus()
+        end
+    end
+end
+
 function RmlUiField:UpdateDisplay()
     -- Override in subclass
 end