feat: add Report/About/Changelog buttons to Support ribbon group

- REPORT opens GitHub new-issue page
- ABOUT opens a dialog window with version, OS and arch info + Copy Info button
- CHANGELOG opens GitHub releases page
- Fix Windows build: add windows-sys as target-specific dependency for PRINT command

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/commands.rs

@@ -2042,6 +2042,20 @@ impl H7CAD {
                 self.command_line.push_info("Opening Patreon page...");
             }
 
+            "REPORT" => {
+                let _ = open::that("https://github.com/HakanSeven12/H7CAD/issues/new");
+                self.command_line.push_info("Opening GitHub issue page...");
+            }
+
+            "ABOUT" => {
+                return Task::done(Message::AboutOpen);
+            }
+
+            "CHANGELOG" => {
+                let _ = open::that("https://github.com/HakanSeven12/H7CAD/releases");
+                self.command_line.push_info("Opening release notes...");
+            }
+
             // ── Keyboard Shortcuts panel ──────────────────────────────────
             cmd if cmd == "SHORTCUTS" || cmd.starts_with("SHORTCUTS ") => {
                 let raw_rest = cmd.trim_start_matches("SHORTCUTS").trim();

src/app/mod.rs

@@ -68,6 +68,7 @@ pub(super) struct H7CAD {
     plotstyle_window:       Option<window::Id>,
     dimstyle_window:        Option<window::Id>,
     shortcuts_window:       Option<window::Id>,
+    about_window:           Option<window::Id>,
     /// In-memory clipboard: cloned entities waiting to be pasted.
     clipboard: Vec<acadrust::EntityType>,
     /// Centroid of the clipboard entities (XZ plane, Y-up).
@@ -372,6 +373,9 @@ pub enum Message {
     ShortcutsPanelOpen,
     #[allow(dead_code)]
     ShortcutsPanelClose,
+    // ── About window ────────────────────────────────────────────────────
+    AboutOpen,
+    AboutCopyInfo,
     /// Close the viewport right-click context menu without performing any action.
     ViewportContextMenuClose,
     /// A window was closed by the OS (e.g. the user clicked the title-bar ✕).
@@ -552,6 +556,7 @@ impl H7CAD {
             plotstyle_window:      None,
             dimstyle_window:       None,
             shortcuts_window:      None,
+            about_window:          None,
             clipboard: Vec::new(),
             clipboard_centroid: glam::Vec3::ZERO,
             layout_context_menu: None,
@@ -644,6 +649,7 @@ pub fn run() -> iced::Result {
             if Some(window_id) == state.plotstyle_window     { return "Plot Style Table Editor".into(); }
             if Some(window_id) == state.dimstyle_window      { return "Dimension Style Manager".into(); }
             if Some(window_id) == state.shortcuts_window     { return "Keyboard Shortcuts".into(); }
+            if Some(window_id) == state.about_window         { return "About H7CAD".into(); }
             if let Some(tab) = state.tabs.get(state.active_tab) {
                 let dot = if tab.dirty { "● " } else { "" };
                 let name = tab.tab_display_name();

src/app/update.rs

@@ -704,6 +704,7 @@ impl H7CAD {
                 if self.plotstyle_window     == Some(id) { self.plotstyle_window     = None; }
                 if self.dimstyle_window      == Some(id) { self.dimstyle_window      = None; }
                 if self.shortcuts_window     == Some(id) { self.shortcuts_window     = None; }
+                if self.about_window         == Some(id) { self.about_window         = None; }
                 Task::none()
             }
 
@@ -2502,6 +2503,30 @@ impl H7CAD {
                 }
             }
 
+            // ── About window ──────────────────────────────────────────────
+            Message::AboutOpen => {
+                if let Some(id) = self.about_window {
+                    return window::gain_focus(id);
+                }
+                let (id, task) = window::open(window::Settings {
+                    size: iced::Size::new(340.0, 240.0),
+                    resizable: false,
+                    ..Default::default()
+                });
+                self.about_window = Some(id);
+                task.map(|_| Message::Noop)
+            }
+
+            Message::AboutCopyInfo => {
+                let info = format!(
+                    "H7CAD v{}\nOS: {}\nArch: {}",
+                    env!("CARGO_PKG_VERSION"),
+                    std::env::consts::OS,
+                    std::env::consts::ARCH,
+                );
+                iced::clipboard::write(info)
+            }
+
             Message::ViewportContextMenuClose => {
                 let i = self.active_tab;
                 self.tabs[i].scene.selection.borrow_mut().context_menu = None;

src/app/view.rs

@@ -96,6 +96,9 @@ impl H7CAD {
         if Some(window_id) == self.shortcuts_window {
             return crate::ui::shortcuts::view_window(&self.shortcut_overrides);
         }
+        if Some(window_id) == self.about_window {
+            return crate::ui::about::view_window();
+        }
 
         let i = self.active_tab;
         let tab = &self.tabs[i];