WIP: Sheet Set Manager palette, wizard, properties and sheet set fields

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/ribbon/mod.rs

@@ -57,6 +57,8 @@ pub struct Ribbon {
     pub show_ucs_icon: bool,
     /// Properties panel (PROPERTIES) visibility — drives the Properties button highlight.
     pub show_properties: bool,
+    /// Sheet Set Manager palette shown (SSMSTATE).
+    pub show_sheet_set: bool,
     /// File tabs (FILETAB) visibility — drives the File Tabs button highlight.
     pub show_file_tabs: bool,
     /// Layout tabs (LAYOUTTAB) visibility — drives the Layout Tabs button highlight.
@@ -173,6 +175,7 @@ impl Ribbon {
             show_viewcube: true,
             show_ucs_icon: true,
             show_properties: true,
+            show_sheet_set: false,
             show_file_tabs: true,
             show_layout_tabs: true,
             open_dropdown: None,
@@ -330,6 +333,9 @@ impl Ribbon {
     pub fn set_properties(&mut self, on: bool) {
         self.show_properties = on;
     }
+    pub fn set_sheet_set(&mut self, on: bool) {
+        self.show_sheet_set = on;
+    }
     pub fn set_file_tabs(&mut self, on: bool) {
         self.show_file_tabs = on;
     }
@@ -348,6 +354,7 @@ impl Ribbon {
             show_ucs_icon: self.show_ucs_icon,
             show_properties: self.show_properties,
             show_block_palette,
+            show_sheet_set: self.show_sheet_set,
             show_file_tabs: self.show_file_tabs,
             show_layout_tabs: self.show_layout_tabs,
         }

src/ui/ribbon/widgets.rs

@@ -38,6 +38,7 @@ pub(super) struct ToggleState {
     pub show_ucs_icon: bool,
     pub show_properties: bool,
     pub show_block_palette: bool,
+    pub show_sheet_set: bool,
     pub show_file_tabs: bool,
     pub show_layout_tabs: bool,
 }
@@ -380,6 +381,7 @@ pub(super) fn is_active_tool(
         "UCSICON" => state.show_ucs_icon,
         "PROPERTIES" => state.show_properties,
         "BLOCKPALETTE" => state.show_block_palette,
+        "SHEETSET" => state.show_sheet_set,
         "FILETAB" => state.show_file_tabs,
         "LAYOUTTAB" => state.show_layout_tabs,
         id => active_tool.as_deref() == Some(id),