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/hooks/useKnockoutExplorer.ts

@@ -69,6 +69,7 @@ import { isInvalidParentFrameOrigin, shouldProcessMessage } from "../Utils/Messa
 import { get, getReadOnlyKeys, listKeys } from "../Utils/arm/generatedClients/cosmos/databaseAccounts";
 import * as Types from "../Utils/arm/generatedClients/cosmos/types";
 import { applyExplorerBindings } from "../applyExplorerBindings";
+import { THEME_MODE_DARK, useThemeStore } from "./useTheme";
 
 // This hook will create a new instance of Explorer.ts and bind it to the DOM
 // This hook has a LOT of magic, but ideally we can delete it once we have removed KO and switched entirely to React
@@ -992,6 +993,21 @@ function updateContextsFromPortalMessage(inputs: DataExplorerInputsFrame) {
       userContext.features.publicGallery = true;
     }
   }
+
+  // Handle initial theme from portal
+  if (inputs.theme && inputs.theme.mode !== undefined) {
+    const isDark = inputs.theme.mode === THEME_MODE_DARK;
+    useThemeStore.setState({
+      isDarkMode: isDark,
+      themeMode: inputs.theme.mode,
+    });
+
+    if (isDark) {
+      document.body.classList.add("isDarkMode");
+    } else {
+      document.body.classList.remove("isDarkMode");
+    }
+  }
 }
 
 interface PortalMessage {