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 -->

e2e-tests/helpers/test_helper.ts

@@ -73,14 +73,23 @@ class ProModesDialog {
 
   async setSmartContextMode(mode: "balanced" | "off" | "conservative") {
     await this.page
+      .getByTestId("smart-context-selector")
       .getByRole("button", {
         name: mode.charAt(0).toUpperCase() + mode.slice(1),
       })
       .click();
   }
 
-  async toggleTurboEdits() {
-    await this.page.getByRole("switch", { name: "Turbo Edits" }).click();
+  async setTurboEditsMode(mode: "off" | "classic" | "search-replace") {
+    await this.page
+      .getByTestId("turbo-edits-selector")
+      .getByRole("button", {
+        name:
+          mode === "search-replace"
+            ? "Search & replace"
+            : mode.charAt(0).toUpperCase() + mode.slice(1),
+      })
+      .click();
   }
 }
 
@@ -362,7 +371,7 @@ export class PageObject {
     await expect(this.page.getByRole("dialog")).toMatchAriaSnapshot();
   }
 
-  async snapshotAppFiles({ name }: { name: string }) {
+  async snapshotAppFiles({ name, files }: { name: string; files?: string[] }) {
     const currentAppName = await this.getCurrentAppName();
     if (!currentAppName) {
       throw new Error("No app selected");
@@ -374,10 +383,17 @@ export class PageObject {
     }
 
     await expect(() => {
-      const filesData = generateAppFilesSnapshotData(appPath, appPath);
+      let filesData = generateAppFilesSnapshotData(appPath, appPath);
 
       // Sort by relative path to ensure deterministic output
       filesData.sort((a, b) => a.relativePath.localeCompare(b.relativePath));
+      if (files) {
+        filesData = filesData.filter((file) =>
+          files.some(
+            (f) => normalizePath(f) === normalizePath(file.relativePath),
+          ),
+        );
+      }
 
       const snapshotContent = filesData
         .map(
@@ -1232,3 +1248,7 @@ function prettifyDump(
     })
     .join("\n\n");
 }
+
+function normalizePath(path: string): string {
+  return path.replace(/\\/g, "/");
+}