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/Panes/PanelContainerComponent.tsx

@@ -63,13 +63,47 @@ export class PanelContainerComponent extends React.Component<PanelContainerProps
         closeButtonAriaLabel={`Close ${this.props.headerText}`}
         customWidth={this.props.panelWidth ? this.props.panelWidth : "440px"}
         headerClassName="panelHeader"
+        className="themed-panel"
         onRenderNavigationContent={this.props.onRenderNavigationContent}
         isFooterAtBottom={true}
         styles={{
-          navigation: { borderBottom: "1px solid #cccccc" },
-          content: { padding: 0 },
-          header: { padding: "0 0 8px 34px" },
-          commands: { marginTop: 8, paddingTop: 0 },
+          navigation: {
+            borderBottom: "1px solid var(--colorNeutralStroke1)",
+            backgroundColor: "var(--colorNeutralBackground1)",
+            color: "var(--colorNeutralForeground1)",
+          },
+          content: {
+            padding: 0,
+            backgroundColor: "var(--colorNeutralBackground1)",
+            color: "var(--colorNeutralForeground1)",
+          },
+          header: {
+            padding: "0 0 8px 34px",
+            backgroundColor: "var(--colorNeutralBackground1)",
+            color: "var(--colorNeutralForeground1)",
+          },
+          commands: {
+            marginTop: 8,
+            paddingTop: 0,
+            backgroundColor: "var(--colorNeutralBackground1)",
+          },
+          root: {},
+          overlay: {
+            backgroundColor: "var(--overlayBackground)",
+          },
+          main: {
+            backgroundColor: "var(--colorNeutralBackground1)",
+          },
+          scrollableContent: {
+            backgroundColor: "var(--colorNeutralBackground1)",
+          },
+          footerInner: {
+            backgroundColor: "var(--colorNeutralBackground1)",
+            color: "var(--colorNeutralForeground1)",
+          },
+          closeButton: {
+            color: "var(--colorNeutralForeground1)",
+          },
         }}
         style={{ height: this.state.height }}
       >