Selected component engine (#1562)

<!-- This is an auto-generated description by cubic. -->

## Summary by cubic
Enable the Dyad Engine to prioritize a user-selected component by
flagging the file as focused and sending codebase files per request.
Keeps full context when the engine is on; falls back to path-scoped
context when it’s off.

- **New Features**
- Mark the selected component file as focused when the engine is
enabled.
- Send codebase files to the engine via dyadFiles, applied to
dyad_options unless disabled.
- Maintain full chatContext with engine; restrict to the selected file
path only when engine is off.

- **Refactors**
- Removed files from getModelClient and provider APIs; file transport
moved into request payload.
- Stream handlers now pass files to model calls and include
dyadDisableFiles/dyadFiles in the request.
  - Added focused flag to CodebaseFile.

<!-- End of auto-generated description by cubic. -->

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Sends codebase files per request to the Dyad Engine, focuses the
selected component when smart context is enabled, and refactors model
client/provider APIs to remove file parameters.
> 
> - **Engine integration**:
> - Send codebase files per request via `dyadFiles` in provider options;
propagate through `simpleStreamText` and `dyad-engine` options.
> - Add `isSmartContextEnabled` from `get_model_client` and gate context
behavior accordingly.
> - **Selected component focus**:
> - When smart context is on and a component is selected, mark its file
as `focused` in `CodebaseFile` and avoid broad smart context includes;
allow on-demand reads.
> - When smart context is off, restrict `chatContext` to the selected
file path.
> - **Refactors**:
> - Remove `files` parameter from `getModelClient` and Dyad provider;
move file transport into request body.
> - Update `llm_engine_provider` to read `dyadFiles` from request and
populate `dyad_options.files` unless `dyadDisableFiles`.
> - Extend `CodebaseFile` with optional `focused` flag; thread `files`
through `chat_stream_handlers` calls.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
022b26d0197ab5b5d4f5b589f45bc230de36e0e5. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

src/ipc/utils/get_model_client.ts

@@ -52,19 +52,15 @@ export interface ModelClient {
   builtinProviderId?: string;
 }
 
-interface File {
-  path: string;
-  content: string;
-}
-
 const logger = log.scope("getModelClient");
 export async function getModelClient(
   model: LargeLanguageModel,
   settings: UserSettings,
-  files?: File[],
+  // files?: File[],
 ): Promise<{
   modelClient: ModelClient;
   isEngineEnabled?: boolean;
+  isSmartContextEnabled?: boolean;
 }> {
   const allProviders = await getLanguageModelProviders();
 
@@ -84,6 +80,7 @@ export async function getModelClient(
     // IMPORTANT: some providers like OpenAI have an empty string gateway prefix,
     // so we do a nullish and not a truthy check here.
     if (providerConfig.gatewayPrefix != null || dyadEngineUrl) {
+      const enableSmartFilesContext = settings.enableProSmartFilesContextMode;
       const provider = createDyadEngine({
         apiKey: dyadApiKey,
         baseURL: dyadEngineUrl ?? "https://engine.dyad.sh/v1",
@@ -93,7 +90,7 @@ export async function getModelClient(
             settings.selectedChatMode === "ask"
               ? false
               : settings.enableProLazyEditsMode,
-          enableSmartFilesContext: settings.enableProSmartFilesContextMode,
+          enableSmartFilesContext,
           // Keep in sync with getCurrentValue in ProModeSelector.tsx
           smartContextMode: settings.proSmartContextOption ?? "balanced",
           enableWebSearch: settings.enableProWebSearch,
@@ -112,15 +109,14 @@ export async function getModelClient(
       // Do not use free variant (for openrouter).
       const modelName = model.name.split(":free")[0];
       const autoModelClient = {
-        model: provider(`${providerConfig.gatewayPrefix || ""}${modelName}`, {
-          files,
-        }),
+        model: provider(`${providerConfig.gatewayPrefix || ""}${modelName}`),
         builtinProviderId: model.provider,
       };
 
       return {
         modelClient: autoModelClient,
         isEngineEnabled: true,
+        isSmartContextEnabled: enableSmartFilesContext,
       };
     } else {
       logger.warn(
@@ -176,7 +172,6 @@ export async function getModelClient(
             name: autoModel.name,
           },
           settings,
-          files,
         );
       }
     }