feat: add tabbed container layout mode with tab bar UI

fix: tab bars no longer shown in overview.  Tab bars show name of app with pipe and then title of the app

src/wm/tabBar.ts

@@ -0,0 +1,125 @@
+import Clutter from 'gi://Clutter';
+import St from 'gi://St';
+import * as Main from 'resource:///org/gnome/shell/ui/main.js';
+import {Logger} from "../utils/logger.js";
+import {WindowWrapper} from "./window.js";
+import {Rect} from "../utils/rect.js";
+
+export const TAB_BAR_HEIGHT = 24;
+
+type TabClickedCallback = (index: number) => void;
+
+export class TabBar {
+    private _bar: St.BoxLayout;
+    private _buttons: St.Button[] = [];
+    private _activeIndex: number = 0;
+    private _onTabClicked: TabClickedCallback;
+    private _visible: boolean = false;
+
+    constructor(onTabClicked: TabClickedCallback) {
+        this._onTabClicked = onTabClicked;
+        this._bar = new St.BoxLayout({
+            style_class: 'aerospike-tab-bar',
+            vertical: false,
+            reactive: true,
+            can_focus: false,
+            track_hover: false,
+        });
+    }
+
+    /**
+     * Rebuild all tab buttons from the current list of window items.
+     */
+    rebuild(items: WindowWrapper[], activeIndex: number): void {
+        // Remove old buttons
+        this._bar.destroy_all_children();
+        this._buttons = [];
+
+        items.forEach((item, index) => {
+            const button = new St.Button({
+                style_class: 'aerospike-tab',
+                reactive: true,
+                can_focus: false,
+                track_hover: true,
+                x_expand: true,
+                child: new St.Label({
+                    text: item.getTabLabel(),
+                    style_class: 'aerospike-tab-label',
+                    y_align: Clutter.ActorAlign.CENTER,
+                    x_align: Clutter.ActorAlign.CENTER,
+                    x_expand: true,
+                }),
+            });
+
+            button.connect('clicked', () => {
+                this._onTabClicked(index);
+            });
+
+            this._bar.add_child(button);
+            this._buttons.push(button);
+        });
+
+        this.setActive(activeIndex);
+    }
+
+    /**
+     * Update just the title text of a single tab (e.g. when a window title changes).
+     */
+    updateTabTitle(index: number, title: string): void {
+        if (index < 0 || index >= this._buttons.length) return;
+        const label = this._buttons[index].get_child() as St.Label;
+        if (label) label.set_text(title);
+    }
+
+    /**
+     * Highlight the active tab and dim the rest.
+     */
+    setActive(index: number): void {
+        this._activeIndex = index;
+        this._buttons.forEach((btn, i) => {
+            if (i === index) {
+                btn.add_style_class_name('aerospike-tab-active');
+            } else {
+                btn.remove_style_class_name('aerospike-tab-active');
+            }
+        });
+    }
+
+    /**
+     * Position and size the tab bar at the given screen rect.
+     */
+    setPosition(rect: Rect): void {
+        this._bar.set_position(rect.x, rect.y);
+        this._bar.set_size(rect.width, rect.height);
+    }
+
+    show(): void {
+        if (this._visible) return;
+        this._visible = true;
+        Main.layoutManager.uiGroup.add_child(this._bar);
+        this._bar.show();
+        Logger.log("TabBar shown");
+    }
+
+    hide(): void {
+        if (!this._visible) return;
+        this._visible = false;
+        this._bar.hide();
+        if (this._bar.get_parent()) {
+            Main.layoutManager.uiGroup.remove_child(this._bar);
+        }
+        Logger.log("TabBar hidden");
+    }
+
+    destroy(): void {
+        this.hide();
+        this._bar.destroy_all_children();
+        this._buttons = [];
+        this._bar.destroy();
+        Logger.log("TabBar destroyed");
+    }
+
+    isVisible(): boolean {
+        return this._visible;
+    }
+}