Turbo edits v2 (#1653)

Fixes #1222 #1646 

TODOs
- [x] description?
- [x] collect errors across all files for turbo edits
- [x] be forgiving around whitespaces
- [x] write e2e tests
- [x] do more manual testing across different models



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds Turbo Edits v2 search-replace flow with settings/UI selector,
parser/renderer, dry-run validation + fallback, proposal integration,
and comprehensive tests; updates licensing.
> 
> - **Engine/Processing**:
> - Add `dyad-search-replace` end-to-end: parsing
(`getDyadSearchReplaceTags`), markdown rendering (`DyadSearchReplace`),
and application (`applySearchReplace`) with dry-run validation and
fallback to `dyad-write`.
> - Inject Turbo Edits v2 system prompt; toggle via
`isTurboEditsV2Enabled`; disable classic lazy edits when v2 is on.
> - Include search-replace edits in proposals and full-response
processing.
> - **Settings/UI**:
> - Introduce `proLazyEditsMode` (`off`|`v1`|`v2`) and helper selectors;
update `ProModeSelector` with Turbo Edits and Smart Context selectors
(`data-testid`s).
> - **LLM/token flow**:
> - Construct system prompt conditionally; update token counting and
chat stream to validate and repair search-replace responses.
> - **Tests**:
> - Add unit tests for search-replace processor; e2e tests for Turbo
Edits v2 and options; fixtures and snapshots.
> - **Licensing/Docs**:
> - Add `src/pro/LICENSE` (FSL 1.1 ALv2 future), update root `LICENSE`
and README license section.
> - **Tooling**:
> - Update `.prettierignore`; enhance test helpers (selectors, path
normalization, snapshot filtering).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7aefa02bfae2fe22a25c7d87f3c4c326f820f1e6. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

src/ipc/handlers/chat_stream_handlers.ts

@@ -30,7 +30,10 @@ import {
   extractCodebase,
   readFileWithCache,
 } from "../../utils/codebase";
-import { processFullResponseActions } from "../processors/response_processor";
+import {
+  dryRunSearchReplace,
+  processFullResponseActions,
+} from "../processors/response_processor";
 import { streamTestResponse } from "./testing_chat_handlers";
 import { getTestResponse } from "./testing_chat_handlers";
 import { getModelClient, ModelClient } from "../utils/get_model_client";
@@ -75,6 +78,7 @@ import { inArray } from "drizzle-orm";
 import { replacePromptReference } from "../utils/replacePromptReference";
 import { mcpManager } from "../utils/mcp_manager";
 import z from "zod";
+import { isTurboEditsV2Enabled } from "@/lib/schemas";
 
 type AsyncIterableStream<T> = AsyncIterable<T> & ReadableStream<T>;
 
@@ -563,6 +567,7 @@ ${componentSnippet}
             settings.selectedChatMode === "agent"
               ? "build"
               : settings.selectedChatMode,
+          enableTurboEditsV2: isTurboEditsV2Enabled(settings),
         });
 
         // Add information about mentioned apps if any
@@ -898,6 +903,7 @@ This conversation includes one or more image attachments. When the user uploads
             systemPromptOverride: constructSystemPrompt({
               aiRules: await readAiRules(getDyadAppPath(updatedChat.app.path)),
               chatMode: "agent",
+              enableTurboEditsV2: false,
             }),
             files: files,
             dyadDisableFiles: true,
@@ -939,6 +945,53 @@ This conversation includes one or more image attachments. When the user uploads
           });
           fullResponse = result.fullResponse;
 
+          if (
+            settings.selectedChatMode !== "ask" &&
+            isTurboEditsV2Enabled(settings)
+          ) {
+            const issues = await dryRunSearchReplace({
+              fullResponse,
+              appPath: getDyadAppPath(updatedChat.app.path),
+            });
+            if (issues.length > 0) {
+              logger.warn(
+                `Detected search-replace issues: ${issues.map((i) => i.error).join(", ")}`,
+              );
+              const formattedSearchReplaceIssues = issues
+                .map(({ filePath, error }) => {
+                  return `File path: ${filePath}\nError: ${error}`;
+                })
+                .join("\n\n");
+              const originalFullResponse = fullResponse;
+              fullResponse += `<dyad-output type="warning" message="Could not apply Turbo Edits properly for some of the files; re-generating code...">${formattedSearchReplaceIssues}</dyad-output>`;
+
+              const { fullStream: fixSearchReplaceStream } =
+                await simpleStreamText({
+                  // Build messages: reuse chat history and original full response, then ask to fix search-replace issues.
+                  chatMessages: [
+                    ...chatMessages,
+                    { role: "assistant", content: originalFullResponse },
+                    {
+                      role: "user",
+                      content: `There was an issue with the following \`dyad-search-replace\` tags. Please fix them by generating the code changes using \`dyad-write\` tags instead.
+                      
+${formattedSearchReplaceIssues}`,
+                    },
+                  ],
+                  modelClient,
+                  files: files,
+                });
+              const result = await processStreamChunks({
+                fullStream: fixSearchReplaceStream,
+                fullResponse,
+                abortController,
+                chatId: req.chatId,
+                processResponseChunkUpdate,
+              });
+              fullResponse = result.fullResponse;
+            }
+          }
+
           if (
             !abortController.signal.aborted &&
             settings.selectedChatMode !== "ask" &&