Smart Context: deep (#1527)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Introduce a new "deep" Smart Context mode that supplies versioned
files (by commit) to the engine, adds code search rendering, stores
source commit hashes, improves search-replace recovery, and updates
UI/tests.
> 
> - **Smart Context (deep)**:
> - Replace `conservative` with `deep`; limit context to ~200 turns;
send `sourceCommitHash` per message.
> - Build and pass `versioned_files` (hash-id map + per-message file
refs) and `app_id` to engine.
> - **DB**:
>   - Add `messages.source_commit_hash` (+ migration/snapshot).
> - **Engine/Processing**:
> - Retry Turbo Edits v2: first re-read then fallback to `dyad-write` if
search-replace fails.
> - Include provider options and versioned files in requests; add
`getCurrentCommitHash`/`getFileAtCommit`.
> - **UI**:
>   - Pro mode selector: new `deep` option; tooltips polish.
> - Add `DyadCodeSearch` and `DyadCodeSearchResult` components; parser
supports new tags.
> - **Tests/E2E**:
> - New `smart_context_deep` e2e; update snapshots to include `app_id`
and deep mode; adjust Playwright timeout.
>   - Unit tests for versioned codebase context.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
e3d3bffabb2bc6caf52103461f9d6f2d5ad39df8. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

testing/fake-llm-server/chatCompletionHandler.ts

@@ -131,17 +131,36 @@ export default Index;
       lastMessage &&
       typeof lastMessage.content === "string" &&
       lastMessage.content.startsWith(
-        "There was an issue with the following `dyad-search-replace` tags",
+        "There was an issue with the following `dyad-search-replace` tags.",
       )
     ) {
-      // Fix errors in create-ts-errors.md and introduce a new error
-      messageContent =
-        `
+      if (lastMessage.content.includes("Make sure you use `dyad-read`")) {
+        // Fix errors in create-ts-errors.md and introduce a new error
+        messageContent =
+          `
+<dyad-read path="src/pages/Index.tsx"></dyad-read>
+
+<dyad-search-replace path="src/pages/Index.tsx">
+<<<<<<< SEARCH
+        // STILL Intentionally DO NOT MATCH ANYTHING TO TRIGGER FALLBACK
+        <h1 className="text-4xl font-bold mb-4">Welcome to Your Blank App</h1>
+=======
+        <h1 className="text-4xl font-bold mb-4">Welcome to the UPDATED App</h1>
+>>>>>>> REPLACE
+</dyad-search-replace>
+` +
+          "\n\n" +
+          generateDump(req);
+      } else {
+        // Fix errors in create-ts-errors.md and introduce a new error
+        messageContent =
+          `
 <dyad-write path="src/pages/Index.tsx" description="Rewrite file.">
 // FILE IS REPLACED WITH FALLBACK WRITE.
 </dyad-write>` +
-        "\n\n" +
-        generateDump(req);
+          "\n\n" +
+          generateDump(req);
+      }
     }
 
     console.error("LASTMESSAGE", lastMessage);