Dark theme for Explorer (#2185)

* First dark theme commits for command bar

* Updated theme on sidebar

* Updated tabs, sidebar, splash screen

* settings theme changes

* Dark theme applied to Monaco editor

* Dark theme to stored procedures

* Fixed sidebar scroll

* Updated scroll issue in sidebar

* Command bar items fixed

* Fixed lint errors

* fixed lint errors

* settings side panel fixed

* Second last iteration for css

* Fixed all the issues of css

* Updated the theme icon for now on DE to change the theme from portal/DE itself

* Formatting issue resolved

* Remove CloudShellTerminalComponent changes - revert to master version

* Fixed test issue

* Fixed formatting issue

* Fix tests: update snapshots and revert xterm imports for compatibility

* Fix xterm imports in CloudShellTerminalComponent to use @xterm packages

* Fix Cloud Shell component imports for compatibility

* Update test snapshots

* Fix xterm package consistency across all CloudShell components

* Fix TypeScript compilation errors in CloudShell components and query Documents

- Standardized xterm package imports across CloudShell components to use legacy 'xterm' package
- Fixed Terminal type compatibility issues in CommonUtils.tsx
- Added type casting for enableQueryControl property in queryDocuments.ts to handle Azure Cosmos SDK interface limitations
- Applied code formatting to ensure consistency

* Update failing snapshot tests

- Updated TreeNodeComponent snapshot tests for loading states
- Updated ThroughputInputAutoPilotV3Component snapshots for number formatting changes (10,00,000 -> 1,000,000)
- All snapshot tests now pass

* Fixed test issue

* Fixed test issue

* Updated the buttons for theme

* Updated the Theme changes based on portal theme changes

* Updated review comments

* Updated the duplicate code and fixed the fabric react error

* Few places styling added and resolving few comments

* Fixed errors

* Fixed comments

* Fixed comments

* Fixed comments

* Fixed full text policy issue for mongoru accounts

* Resolved comments for class Name and few others

* Added css for homepage in ru accounts

* Final commit with all the feedback issues resolved

* Lint error resolved

* Updated the review comments and few Ui issues

* Resolved review comments and changed header bg and active state color

* Moved svg code to different file and imported

* css fixed for the hpome page boxed for ru account

* Lint errors

* Fixed boxes issue in ru accounts

* Handled the initial theme from the portal

* Updated snap

* Update snapshots for TreeNodeComponent and CreateCopyJobScreensProvider tests

* Fix duplicate DataExplorerRoot test id causing Playwright strict mode violation

* Fix locale-dependent number formatting in ThroughputInputAutoPilotV3Component

---------

Co-authored-by: Sakshi Gupta <sakshig+microsoft@microsoft.com>
Co-authored-by: Sakshi Gupta <sakshig@microsoft.com>

src/Explorer/Menus/CommandBar/ThemeToggleButton.tsx

@@ -0,0 +1,29 @@
+import * as React from "react";
+import MoonIcon from "../../../../images/MoonIcon.svg";
+import SunIcon from "../../../../images/SunIcon.svg";
+import { useThemeStore } from "../../../hooks/useTheme";
+import { CommandButtonComponentProps } from "../../Controls/CommandButton/CommandButtonComponent";
+
+export const ThemeToggleButton = (): CommandButtonComponentProps => {
+  const [darkMode, setDarkMode] = React.useState(useThemeStore.getState().isDarkMode);
+
+  React.useEffect(() => {
+    const unsubscribe = useThemeStore.subscribe((state) => {
+      setDarkMode(state.isDarkMode);
+    });
+    return unsubscribe;
+  }, []);
+
+  const tooltipText = darkMode ? "Switch to Light Theme" : "Switch to Dark Theme";
+
+  return {
+    iconSrc: darkMode ? SunIcon : MoonIcon,
+    iconAlt: "Theme Toggle",
+    onCommandClick: useThemeStore.getState().toggleTheme,
+    commandButtonLabel: undefined,
+    ariaLabel: tooltipText,
+    tooltipText: tooltipText,
+    hasPopup: false,
+    disabled: false,
+  };
+};