feat: add enable/disable toggle for code indexing feature

- Add checkbox to enable/disable code indexing in settings
- Persist enabled state across sessions
- Stop indexing service when feature is disabled
- Move description to tooltip for consistent UI
- Update translations to remove experimental status

Author: daniel-lxs

src/core/webview/ClineProvider.ts

@@ -1509,12 +1509,12 @@ export class ClineProvider
 			condensingApiConfigId,
 			customCondensingPrompt,
 			codebaseIndexModels: codebaseIndexModels ?? EMBEDDING_MODEL_PROFILES,
-			codebaseIndexConfig: codebaseIndexConfig ?? {
-				codebaseIndexEnabled: true,
-				codebaseIndexQdrantUrl: "http://localhost:6333",
-				codebaseIndexEmbedderProvider: "openai",
-				codebaseIndexEmbedderBaseUrl: "",
-				codebaseIndexEmbedderModelId: "",
+			codebaseIndexConfig: {
+				codebaseIndexEnabled: codebaseIndexConfig?.codebaseIndexEnabled ?? true,
+				codebaseIndexQdrantUrl: codebaseIndexConfig?.codebaseIndexQdrantUrl ?? "http://localhost:6333",
+				codebaseIndexEmbedderProvider: codebaseIndexConfig?.codebaseIndexEmbedderProvider ?? "openai",
+				codebaseIndexEmbedderBaseUrl: codebaseIndexConfig?.codebaseIndexEmbedderBaseUrl ?? "",
+				codebaseIndexEmbedderModelId: codebaseIndexConfig?.codebaseIndexEmbedderModelId ?? "",
 			},
 			mdmCompliant: this.checkMdmCompliance(),
 			profileThresholds: profileThresholds ?? {},
@@ -1667,12 +1667,14 @@ export class ClineProvider
 			condensingApiConfigId: stateValues.condensingApiConfigId,
 			customCondensingPrompt: stateValues.customCondensingPrompt,
 			codebaseIndexModels: stateValues.codebaseIndexModels ?? EMBEDDING_MODEL_PROFILES,
-			codebaseIndexConfig: stateValues.codebaseIndexConfig ?? {
-				codebaseIndexEnabled: true,
-				codebaseIndexQdrantUrl: "http://localhost:6333",
-				codebaseIndexEmbedderProvider: "openai",
-				codebaseIndexEmbedderBaseUrl: "",
-				codebaseIndexEmbedderModelId: "",
+			codebaseIndexConfig: {
+				codebaseIndexEnabled: stateValues.codebaseIndexConfig?.codebaseIndexEnabled ?? true,
+				codebaseIndexQdrantUrl:
+					stateValues.codebaseIndexConfig?.codebaseIndexQdrantUrl ?? "http://localhost:6333",
+				codebaseIndexEmbedderProvider:
+					stateValues.codebaseIndexConfig?.codebaseIndexEmbedderProvider ?? "openai",
+				codebaseIndexEmbedderBaseUrl: stateValues.codebaseIndexConfig?.codebaseIndexEmbedderBaseUrl ?? "",
+				codebaseIndexEmbedderModelId: stateValues.codebaseIndexConfig?.codebaseIndexEmbedderModelId ?? "",
 			},
 			profileThresholds: stateValues.profileThresholds ?? {},
 		}

src/core/webview/webviewMessageHandler.ts

@@ -1936,9 +1936,10 @@ export const webviewMessageHandler = async (
 				const embedderProviderChanged =
 					currentConfig.codebaseIndexEmbedderProvider !== settings.codebaseIndexEmbedderProvider
 
-				// Save global state settings atomically (without codebaseIndexEnabled which is now in global settings)
+				// Save global state settings atomically
 				const globalStateConfig = {
 					...currentConfig,
+					codebaseIndexEnabled: settings.codebaseIndexEnabled,
 					codebaseIndexQdrantUrl: settings.codebaseIndexQdrantUrl,
 					codebaseIndexEmbedderProvider: settings.codebaseIndexEmbedderProvider,
 					codebaseIndexEmbedderBaseUrl: settings.codebaseIndexEmbedderBaseUrl,